Opposition and efforts to repeal the legislation have drawn support from sources that include labor unions, These groups claimed the law would disrupt existing health plans, increase costs from new insurance standards, and increase the deficit. Some opposed the idea of
universal healthcare. President
Donald Trump repeatedly promised to "repeal and replace" it. unions that expressed concerns included the
AFL–CIO, Dayton later said he regretted his remarks after they were seized on by Republicans seeking to repeal the law.
Socialism debate Many economically conservative opponents called the ACA "
socialist" or "
socialized medicine", pointing to the government redistribution of wealth via subsidies for low-income purchasers of private insurance, expansion of Medicaid, government requirements as to what products can be sold on the exchanges, and the individual mandate, which reduces freedom of consumer choice to be uninsured. Other observers considered the law a relatively capitalist or "regulated free-market" means of paying for near-universal health care, because it creates new marketplaces with choices for consumers, largely relies on private employers and private health insurance companies, maintains private ownership of hospitals and doctor's offices, and was originally advocated by economic conservatives as a capitalist alternative to
single-payer health care. Some pointed out that the previous system also had socialist aspects. Even for-profit private health insurance companies socialize risk and redistribute wealth from people who have it (all premium payers) to those who need it (by paying for medically necessary healthcare). and
communism as undesirable.
Legal challenges National Federation of Independent Business v. Sebelius Opponents challenged ACA's constitutionality in multiple lawsuits on multiple grounds. The Supreme Court ruled, 5–4, that the individual mandate was constitutional when viewed as a tax, although
not under the
Commerce Clause. ACA withheld all Medicaid funding from states declining to participate in the expansion. The Court ruled that this was unconstitutionally coercive and that individual states had the right to opt out without losing preexisting Medicaid funding.
Contraception mandate In March 2012, the
Catholic Church, while supportive of ACA's objectives, voiced concern through the
United States Conference of Catholic Bishops that aspects of the mandate covering contraception and sterilization and
HHS's narrow definition of a religious organization violated the
First Amendment right to
free exercise of religion and conscience. Various lawsuits addressed these concerns, including
Burwell v. Hobby Lobby Stores, Inc., which looked at private corporations and their duties under the ACA. In
Little Sisters of the Poor Saints Peter and Paul Home v. Pennsylvania, the Supreme Court ruled 7–2 on July 8, 2020, that employers with religious or moral objections to contraceptives can exclude such coverage from an employee's insurance plan. Writing for the majority, Justice
Clarence Thomas said, "No language in the statute itself even hints that Congress intended that contraception should or must be covered. It was Congress, not the [administration], that declined to expressly require contraceptive coverage in the ACA itself." Justices Roberts, Alito, Gorsuch, and Kavanaugh joined Thomas's opinion. Justice
Elena Kagan filed a concurring opinion in the judgment, in which
Stephen Breyer joined. Justices Ginsburg and Sotomayor dissented, saying the court's ruling "leaves women workers to fend for themselves." In a later lawsuit brought by private health insurance buyers and businesses, Judge
Reed O'Connor of the Federal District Court for the Northern District of Texas ruled in March 2023 that the ACA's provision of contraceptives, HIV testing, and screenings for cancer, diabetes, and mental health violated the plaintiffs' freedom of religious exercise, and placed an injunction on that portion of the ACA. The Biden administration planned to seek a hold on O'Connor's decision.
King v Burwell On June 25, 2015, the U.S. Supreme Court ruled, 6–3, that federal subsidies for health insurance premiums could be used in the 34 states that did not set up their own insurance exchanges.
House v. Price House Republicans sued the Obama administration in 2014, alleging that cost-sharing reduction subsidy payments to insurers were unlawful because Congress had not appropriated funds to pay for them. The argument classified the CSR subsidy as discretionary spending subject to annual appropriation. In May 2016, a federal judge ruled for the plaintiffs, but the Obama administration appealed. Later, President Trump ended the payments. This led to further litigation.
United States House of Representatives v. Azar The House sued the administration, alleging that the money for CSRs to insurers had not been appropriated, as required for any federal government spending. The ACA subsidy that helps customers pay premiums was not part of the suit. Without the CSRs, the government estimated that premiums would increase by 20% to 30% for silver plans. In 2017, the uncertainty about whether the payments would continue caused Blue Cross Blue Shield of North Carolina to try to raise premiums by 22.9% the next year, as opposed to an increase of 8.8% that it would have sought if the payments were assured. U.S. District Judge
Rosemary M. Collyer ruled that the cost-sharing program was unconstitutional for spending money that has not been specifically provided by an act of Congress, but concluded that Congress had in fact authorized that program to be created. The judge also found that Congress had provided authority to cover the spending for the tax credits to consumers who use them to help afford health coverage. Collyer enjoined further cost-sharing payments, but stayed the order pending appeal to the
United States Court of Appeals for the District of Columbia Circuit. The case ended in a settlement before the Circuit Court.
California v. Texas Texas and 19 other states filed a civil suit in the
United States District Court for the Northern District of Texas in February 2018, arguing that with the passage of the
Tax Cuts and Jobs Act of 2017, which eliminated the tax for not having health insurance, the individual mandate no longer had a constitutional basis and thus the entire ACA was no longer constitutional. The
Department of Justice said it would no longer defend the ACA in court, but 17 states led by California stepped in to do so. O'Connor's decision regarding severability turned on several passages from the Congressional debate that focused on the importance of the mandate. While he ruled the law unconstitutional, he did not overturn the law. The intervening states appealed the decision to the
Fifth Circuit. These states argued that Congress's change in the tax was only reducing the amount of the tax, and that Congress had the power to write a stronger law to this end. O'Connor stayed his decision pending the appeal. The Fifth Circuit heard the appeal on July 9, 2019; in the interim, the U.S. Department of Justice joined with Republican states to argue that the ACA was unconstitutional, while the Democratic states were joined by the Democrat-controlled U.S. House of Representatives. An additional question was addressed, as the Republican plaintiffs challenged the Democratic states'
standing to defend the ACA. In December 2019, the Fifth Circuit agreed the individual mandate was unconstitutional, but did not agree that the entire law should be voided. Instead, it remanded the case to the District Court for reconsideration of that question. The Supreme Court accepted the case in March 2020, to be heard in the 2020–2021 term, with the ruling likely falling after the 2020 elections. Democrats pointed out that the effect of invalidating the entire law would be to remove popular provisions such as the protection for preexisting conditions, and that the Republicans had still not offered any replacement plan—important issues in the 2020 elections.
Section 1557 In April 2024, the Biden administration issued a final rule implementing Section 1557 of the ACA, adding
gender identity to
Title IX's definition of discrimination based on
sex. In May 2024, 15 states led by
Tennessee sued HHS in the
U.S. District Court for the Southern District of Mississippi, arguing that the 2024 rule violated the
Administrative Procedure Act and the U.S. Constitution. In October 2025, a federal judge struck down the 2024 rule to the extent that it prohibits discrimination against
transgender people in education and health-care programs.
Risk corridors The Supreme Court ruled that promised risk corridor payments must be made even in the absence of specific appropriation of money by Congress.
Repeal and modification efforts ACA was the subject of many unsuccessful repeal efforts by
Republicans in the
111th,
112th, and
113th Congresses: Representatives
Steve King and
Michele Bachmann introduced bills in the House to repeal the ACA the day after it was signed, as did Senator
Jim DeMint in the Senate. In 2011, after Republicans gained control of the House, one of the first votes held was on a bill titled "Repealing the Job-Killing Health Care Law Act" (H.R. 2), which the House passed 245–189. All Republicans and three Democrats voted for repeal. In the Senate, the bill was offered as an amendment to an unrelated bill, but was voted down. President Obama said he would
veto the bill had it passed. On February 3, 2015, the House of Representatives added its 67th repeal vote to the record (239 to 186). This attempt also failed.
2013 federal government shutdown Strong partisan disagreement in Congress prevented adjustments to the Act's provisions. Some Congressional Republicans argued against improvements to the law on the grounds that they would weaken the arguments for repeal. and in October 2013 House Republicans refused to fund the federal government unless it came with an implementation delay, after Obama unilaterally deferred the employer mandate by one year, which critics claimed he had no power to do. The House passed three versions of a bill funding the government while submitting various versions that would repeal or delay the ACA, with the last version delaying enforcement of the individual mandate. The Democratic Senate leadership said the Senate would pass only a bill without any restrictions on ACA.
The government shutdown lasted from October 1 to October 17.
2017 repeal effort During a midnight congressional session starting January 11, the Senate of the
115th Congress of the United States voted to approve a "budget blueprint" that would allow
Republicans to repeal parts of the law "without threat of a
Democratic filibuster". The plan, which passed 51–48, was named by Senate Republicans the "Obamacare 'repeal resolution. Democrats opposing the resolution staged a protest during the vote.
House Republicans announced their replacement, the
American Health Care Act, on March 6. On March 24, the AHCA failed amid a revolt among Republican representatives. On May 4 the House voted to pass the AHCA by a margin of 217 to 213. The Senate Republican leadership announced that Senate Republicans would write their own version of the bill instead of voting on the House version.
Leader McConnell named a group of 13 Republicans to draft the substitute version in private, raising bipartisan concerns about lack of transparency. On June 22, Republicans released the first discussion draft, which renamed it the "Better Care Reconciliation Act of 2017" (BCRA). On July 25, although no amendment proposal had garnered majority support, Republicans voted to advance the bill to the floor and begin formal consideration of amendments. Senators
Susan Collins and
Lisa Murkowski were the only two dissenting Republicans, making the vote a 50–50 tie. Vice President
Mike Pence then cast the tie-breaking vote in the affirmative. The revised BCRA failed, 43–57. A subsequent "Obamacare Repeal and Reconciliation Act" abandoned the "repeal and replace" approach in favor of a straight repeal, but that too failed, 45–55. Finally, the "Health Care Freedom Act", nicknamed "skinny repeal" because it would have made the least change to ACA, failed by 49–51, with Collins, Murkowski, and McCain joining all Democrats and independents in voting against it.
Proposed changes in 2024 Donald Trump, who has historically opposed the ACA, said during the
2024 United States presidential debates that he had "concepts of a plan" to modify or scrap it.
JD Vance has said that Trump intends to allow insurance companies to discriminate against people with preexisting conditions or
disability, with
subsidized insurance replaced with private insurance. Kamala Harris said during
her 2024 campaign that she would "maintain and grow" the ACA.
2025 federal government shutdown During the
2025 federal government shutdown, the ACA once again became a focal point of partisan disagreement. On November 8–9, 2025, as the shutdown reached its 39th day, President
Donald Trump urged Senate Republicans to redirect federal funds used for ACA insurance subsidies toward direct cash payments to individuals, framing the proposal as a strategy to resolve the budgetary impasse. Several Republican senators expressed openness to the idea; Democrats rejected it. Analysts noted that the proposal lacked the bipartisan support necessary to reopen the federal government. Contemporary reports described the dispute over the ACA's subsidy structure as one of the key issues contributing to the protracted shutdown. Trump said he believed the law will expire once its tax credit is eliminated and not renewed. The disagreement focused on whether to continue the enhanced premium tax credits expanded under previous legislation, including the American Rescue Plan, which lowered the portion of health insurance costs consumers pay. Observers noted that if these subsidies expired, many individuals could face significant premium increases, potentially more than doubling for some enrollees. This raised concerns about decreased enrollment in the ACA marketplaces, especially among individuals who previously received little or no subsidy. In addition to the effects on consumers, small businesses and self-employed individuals relying on ACA marketplace plans faced potential financial strain. Reports also highlighted that certain federal health agency employees were furloughed during the shutdown, temporarily affecting the oversight and administration of health programs. The debate over ACA funding illustrated how federal budget impasses can have immediate effects on both insurance markets and the delivery of health services.
Actions to hinder implementation Under both the ACA (current law) and the AHCA, the CBO reported that the health exchange marketplaces would remain stable. Concern about the exchanges became another argument for reforms. Past and ongoing Republican attempts to weaken the law have included: • Lawsuits such as
King v. Burwell and
House v. Price. • President Trump ended the payment of
cost-sharing reduction subsidies to insurers on October 12, 2017. CBO estimated in September 2017 that discontinuing the payments would add an average of 15–20 percentage points to health insurance costs on the exchanges in 2018 while increasing the budget deficit nearly $200 billion over a decade. In response, insurers sued the government for reimbursement. Various cases are under appeal as of 2019. The insurers would need to make up the $7 billion they had previously received in cost-sharing reductions (CSRs) by raising premiums. Since most premiums are subsidized, the federal government would cover most of the increases. CBO also estimated that initially up to one million fewer people would have health insurance coverage, although rising subsidies might eventually offset this. The 85% of enrollees who received subsidies would be unaffected. CBO expected the exchanges to remain stable (i.e., no "death spiral" before or after Trump's action) as the premiums would increase and prices would stabilize at the higher (non-CSR) level. Several insurance companies who sued the United States for failure to pay CSRs won cases in 2018 and 2019. The judiciary decided the insurance companies are entitled to unpaid CSRs. • The 2015 appropriations bill had a rider that ended the payment of risk corridor funds. This was repeated in later years. This resulted in the bankruptcy of many co-ops. This action was attributed to Senator
Marco Rubio. The cutoff generated some 50 lawsuits. The Supreme Court granted
certiorari in 2019 in the case
Maine Community Health Options v. United States. • Trump weakened the individual mandate with his first executive order, which limited enforcement of the tax. For example, tax returns without indications of health insurance ("silent returns") will still be processed, overriding Obama's instructions to reject them. • Trump reduced funding for advertising for exchange enrollment by up to 90%, with other reductions to support resources used to answer questions and help people sign-up for coverage. The CBO said the reductions would reduce ACA enrollment. • Trump made public statements that the exchanges were unstable or in a
death spiral.
Perceived inadequacies In December 2009, former DNC chairman and former Vermont governor
Howard Dean called the ACA "a bigger
bailout for the insurance industry than
AIG" and "an insurance company's dream". He viewed the bill's end form as a death of the health care reform effort. In his 2011 book
Remedy and Reaction,
Paul Starr, the former senior advisor for
Bill Clinton's
health care reform plan, notes that the ACA did not make
health insurance a right and did not make medical care free at the
point of service. He criticizies the ACA on the grounds that some lower-income individuals still cannot afford treatment and go without care "if health care and insurance are treated as ordinary commodities". The ACA's critics often cite its inability to control costs and lower deductibles, the difficulty for average people to compare plans, lack of a strong public option, and inadequate regulations on or alternatives (such as
co-operatives) to large corporate health care companies. ==Implementation==