Members of Donald Trump's presidential transition team are laying the groundwork for the United States to withdraw from the World Health Organization on the first day of his second term, according to a health law expert familiar with the discussions.

"I have it on good authority that he plans to withdraw, probably on day 1 or very early in his administration," said Lawrence Gostin, professor of global health at Georgetown University in Washington and director of the WHO Collaborating Center on National and Global Health Law.

The Financial Times was the first to report on the plans, citing two experts. The second expert, former White House COVID-19 response coordinator Ashish Jha, was not immediately available for comment. 

The Trump transition team did not immediately respond to a request for comment.

The plan, which aligns with Trump's longstanding criticism of the U.N. health agency, would mark a dramatic shift in U.S. global health policy and further isolate Washington from international efforts to battle pandemics.

Trump has nominated several critics of the organization to top public health positions, including Robert F. Kennedy Jr., a vaccine skeptic who is up for the post of secretary of Health and Human Services, which oversees all major U.S. health agencies including the CDC and FDA. 

Trump initiated the year-long withdrawal process from the WHO in 2020 but 6 months later, President Joe Biden, reversed the decision.

Trump has argued that the agency failed to hold China accountable for the early spread of COVID-19. He has repeatedly called the WHO a puppet of Beijing and vowed to redirect U.S. contributions to domestic health initiatives.

A WHO spokesperson declined to directly comment but referred to comments by WHO Director-General Tedros Adhanom Ghebreyesus at a press briefing on Dec. 10 in which he was asked whether he was concerned that the Trump administration would withdraw from the organization. Tedros said at the time that the WHO needed to give the U.S. time and space for the transition. He also voiced confidence that states could finalize a pandemic agreement by May 2025.

Critics warn that a U.S. withdrawal could undermine global disease surveillance and emergency response systems. "The U.S. would lose influence and clout in global health and China would fill the vacuum. I can't imagine a world without a robust WHO. But U.S. withdrawal would severely weaken the agency," Gostin said.