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.

Public health experts warn that pulling out of WHO, which Trump attacked for its response to COVID-19, will leave Americans more vulnerable to health threats.

As he signed an executive order, President Donald Trump said that the World Health Organization had "ripped us off."

President Donald Trump used one of the flurry of executive actions that he issued on his first day back in the White House to begin the process of withdrawing the U.S. from the World Health

How America's legacy of combating threats to global health security - including at home in the United States - is at risk.

Public health experts say U.S. withdrawal from the W.H.O. would undermine the nation’s standing as a global health leader and make it harder to fight the next pandemic.

One of President Trump’s first executive orders removes the U.S. from the global health organization, which experts say is “cataclysmic.”

President Trump’s executive order for the U.S. to withdraw from the World Health Organization could greatly impact the nation’s ability to track and respond to global disease threats.

The U.S.'s decision to withdraw from the World Health Organization has received global criticism, with the WHO expressing regret.

He could turn his rash action into a negotiation that might strengthen global health.