Ooh, that’s a big one,” Donald Trump said Monday as he signed an executive order – one of dozens during his first hours as president – to withdraw the United States from the World Health Organization.

Experts say the sudden stoppage is a surprise and will set back work on investigating and trying to stop outbreaks of Marburg virus and mpox in Africa.

More than half of Americans believe the U.S. benefits from its membership in the WHO. As of April 2024, 25% of U.S. adults say the country benefits a great deal from its membership, while about one-third say it benefits a fair amount. Conversely, 38% say the U.S. does not benefit much or at all from WHO membership.

The United States has plans to withdraw from the World Health Organization (WHO), the agency announced Tuesday, right after President Donald Trump signed an executive order formalizing the decision.

As part of a rash of executive orders completed on his first day back in the White House, President Donald Trump began the nation’s exit from the World Health Organization. Here, we explain how the withdrawal would work and what it would mean,