On January 16, 2018, Murphy was sworn in as the 56th governor of New Jersey at the
Trenton War Memorial, succeeding
Chris Christie. In one of his first executive orders, Murphy signed to revive subsidies for
wind power in the state. The next month, he signed legislation committing New Jersey to the
Paris Agreement, an international treaty on
climate change. Murphy also ensured that the state sued the
U.S. Environmental Protection Agency for suspending the
Clean Water Rule. In March, he signed legislation that automatically registers anyone who applies for a driver's license or state ID to vote. By June, Murphy had signed legislation to permit
sports betting in the state. In December, he signed into law new legislation that overhauled the way
NJ Transit is managed. In April 2019, Murphy signed a law allowing terminally ill patients with less than six months to live to choose to end their lives with a doctor's assistance. A month later, he signed legislation expanding the time period during which alleged sexual assault victims could sue their alleged attackers. In June, Murphy signed a law restricting the use of solitary confinement in New Jersey prisons. In October, he announced his opposition to the construction of a new power plant in
New Jersey Meadowlands in
North Bergen.
Donald Trump in April 2020 in September 2021 In 2020, Murphy's governorship was dominated by the
COVID-19 pandemic. The first case in the state was reported on March 5, and Murphy declared a
state of emergency on March 9. He signed multiple executive orders in late March that ordered a lockdown of the entire state. By April, most schools and businesses had shut down, with students
required to learn from home. By summer, Murphy had reopened most restaurants but
imposed extensive mask mandates. By July, COVID-related deaths in the state neared 16,000 and over 100,000 residents had tested positive. In the
2020 United States presidential election, Murphy initially endorsed New Jersey senator
Cory Booker for the Democratic nomination. After Booker dropped out of the race in January 2020, Murphy announced he did not intend to endorse any of the candidates still in the race. In February 2021, Murphy signed multiple bills that liberalized the state's cannabis laws. The bills created a regulated cannabis industry in the state, permitted residents to carry up to six ounces of cannabis, and expunged 250,000 low-level cannabis arrests. Under the new laws, the scent of alcohol or cannabis can no longer be used to justify a search by law enforcement. In June, Murphy signed an executive order ending the COVID public health emergency while retaining some executive privileges and restrictions. After his reelection
in November, Murphy said he intended to have every child in school by winter. alongside security, October 2022 In July 2022, Murphy was elected chair of the
National Governors Association, becoming the first person from New Jersey to hold the office. In April 2023, Murphy intervened in the
2023 Rutgers University strike, inviting union representatives and the university administration to his office to negotiate. The strike ended after five days of negotiations led by Murphy. Murphy signed an executive order that would require all state departments and agencies to protect patients and health care professionals against legal repercussions for providing, receiving, assisting in providing or receiving, seeking, and traveling to New Jersey for gender-affirming health care services. From July 28 to August 13, 2023, Murphy went on vacation, during which time
Lieutenant Governor Sheila Oliver became acting governor. On July 31, Oliver was rushed to the
Cooperman Barnabas Medical Center for a medical emergency; she died on August 1.
New Jersey Senate President
Nicholas Scutari served as acting governor until Murphy returned. On September 8, Murphy appointed
secretary of State Tahesha Way lieutenant governor. After
United States Senator Bob Menendez resigned on August 20, 2024, Murphy appointed
George Helmy, who had been Murphy's chief of staff from 2019 to 2023, to finish Menendez's term. In November, Representative
Andy Kim was
elected to replace Menendez, and Helmy promptly resigned so Kim could take his seat. In December 2024, Murphy signed a bill prohibiting
book bans in New Jersey. In his last year as governor, he granted 455 pardons and commutations.
New York congestion pricing On July 21, 2023, Murphy sued the
U.S. Department of Transportation and the
Federal Highway Administration over New York's plan to implement
congestion pricing in Manhattan's most congested areas. He had argued that the program, which was intended to reduce air pollution and fund for public transit, violated the
National Environmental Protection Act, which requires full environmental impact reviews of projects. Environmentalists criticized Murphy for claiming to be an environmentalist while trying to stop congestion pricing from going into effect in one of the world's most polluted and congested areas. In February 2025, the Trump administration issued an order terminating the plan. Trump declared himself a king in the message announcing the termination, and Murphy applauded Trump's decision.
Public opinion In April 2018, a poll found that Murphy was approved by a plurality of New Jersey residents, with 44 percent approving and 28 percent disapproving of his performance as governor; another 28 percent said they had no opinion. In February 2019, a
Monmouth University survey found that Murphy's approval rating had slipped to 43 percent and his disapproval rating had risen to 40 percent. For most of 2019, Murphy ranked among the 10 least popular governors in the U.S., according to
U.S. News & World Report. A September 2019 Monmouth University survey found that 41 percent of New Jersey residents approved of Murphy and 38 percent disapproved. Another survey showed that 31 percent felt that Murphy's policies had hurt the middle class in the state, while only 17 percent said they had benefited. During the COVID-19 pandemic, Murphy's approval rating saw a sizable uptick; a July 2020
Fairleigh Dickinson University poll found that Murphy's approval rating had increased to 67 percent, and it remained above 60 percent for the rest of the year. By mid-2023, polling indicated that opinion of Murphy's governorship had become considerably more divided, with Rutgers-Eagleton and Monmouth University surveys finding that his approval ratings had fallen to 47 and 50 percent respectively. In 2025, polling by
Emerson College found that Murphy's approval rating had fallen to 40% in May and 35% in September. ==Personal life==