According to
FiveThirtyEight, Sullivan voted in line with President
Donald Trump's position 91.5% of the time. According to the
American Conservative Union's Center for Legislative Accountability, Sullivan had a lifetime conservative rating of 79.5.
Americans for Democratic Action gave Sullivan a liberalism score of zero in 2019.
Abortion Sullivan is a self-described "
pro-life Catholic" and supported the
June 2022 overturning of Roe v. Wade. He supports improving child care and adoption as alternatives to
abortion.
Donald Trump Sullivan opposed Donald Trump during the
2016 United States presidential election, releasing a statement that said, "We need national leaders who can lead by example" on issues of sexual assault and violence against women. Sullivan added, "The reprehensible revelations about Donald Trump have shown that he can't. Therefore, I am withdrawing my support for his candidacy." Sullivan voted to acquit Trump in his
first impeachment trial. During Sullivan's reelection bid, Trump endorsed him, saying Sullivan supported Trump's agenda. On October 5, 2020, Sullivan announced that he would vote for Trump, saying the choice was "very clear". Sullivan also voted to acquit Trump in his
second impeachment trial. In 2025, Sullivan enthusiastically defended the policies of the
second Trump administration, including
DOGE's attempted spending cuts.
Environment Doug Burgum in
Anchorage, June 2025 Sullivan rejects that there is a
scientific consensus on climate change. Sullivan's amendment was not included in the legislation's final version.
Foreign policy in Israel on October 22, 2023 In July 2017, Sullivan co-sponsored the
Israel Anti-Boycott Act (s. 720), which would have made it a federal crime for Americans to encourage or participate in boycotts against Israel and
Israeli settlements in the
occupied territories if protesting actions by the Israeli government. On June 6, 2021, Sullivan and Senators
Tammy Duckworth and
Christopher Coons visited
Taipei in an
U.S. Air Force C-17 Globemaster III transport to meet
President Tsai Ing-wen and
Minister Joseph Wu during the
pandemic outbreak of
Taiwan to announce President
Joe Biden's donation plan of 750,000
COVID-19 vaccines included in the global
COVAX program. On March 14, 2025, Sullivan warned
British Columbia not to "mess with Alaska", even as state Republicans reaffirmed their friendship with the province. He proposed cutting off the ferry service to
Victoria and
Nanaimo, noting that this was done during the
COVID-19 pandemic.
Gun policy event in Alaska. In the
2014 Senate campaign in Alaska, the
NRA Political Victory Fund declined to make an endorsement. The NRA gave Begich an "A−" grade and Sullivan an "AQ" rating, the "Q" indicating the rating was qualified because Sullivan had no voting record at the time.
Judiciary In 2016, Sullivan defended the Republican refusal to hold a hearing for President
Barack Obama's Supreme Court nominee,
Merrick Garland, on the basis that the nomination was made "in the midst of an important national election." Sullivan said it was not "about the individual, it's about the principle" and "Alaskans deserve to have a voice in that direction through their vote, and we will ensure that they have one."
Missile defense system In 2017, after
North Korean leader
Kim Jong-un threatened the United States with an
intercontinental ballistic missile (ICBM) strike and conducted an
ICBM test in which its missile landed about off the coast of Japan, Sullivan called for improvements to the U.S.
missile defense system.
Social policy Sullivan has not made social issues a major part of his platform. He opposes abortion, except in cases of rape, incest, or threat to the life of the mother. Trump signed the bill into law 3 days later. Sullivan has cosponsored the bipartisan
STATES Act proposed in the
115th U.S. Congress by
Massachusetts Senator Elizabeth Warren and
Colorado Senator Cory Gardner that would exempt individuals or corporations in compliance with state cannabis laws from federal enforcement of the
Controlled Substances Act.
2021 National Defense Authorization Act In December 2020, during his lame-duck period, Trump vetoed the
National Defense Authorization Act for Fiscal Year 2021.
Fiscal Responsibility Act of 2023 Sullivan was among the 31 Senate Republicans who voted against final passage of the
Fiscal Responsibility Act of 2023. ==Personal life==