"World Health ripped us off, everybody rips off the United States. It's not going to happen anymore," Trump said at the signing of an executive order on the withdrawal, shortly after his inauguration to a second term.
The WHO did not immediately respond to a request for comment.
The move means the U.S. will leave the United Nations health agency in 12 months' time and stop all financial contributions to its work. The United States is by far the WHO's biggest financial backer, contributing around 18% of its overall funding. WHO's most recent two-year budget, for 2024-2025, was $6.8 billion.
The U.S. departure will likely put at risk programmes across the organisation, according to several experts both inside and outside the WHO, notably those tackling
tuberculosis, the world’s biggest infectious disease killer, as well as HIV/AIDS and other health emergencies.
Trump's order said the administration would cease negotiations on the WHO pandemic treaty while the withdrawal is in progress. U.S. government personnel working with the WHO will be recalled and reassigned, and the government will look for partners to take over necessary WHO activities, according to the order.
The government will review, rescind, and replace the 2024 U.S. Global Health Security Strategy as soon as practicable, the order says.
The next-largest donors to the WHO are the Bill & Melinda Gates Foundation, although most of that funding goes to polio eradication, and the global vaccine group
Gavi, followed by the European Commission and the World Bank. The next-largest national donor is Germany, which contributes around 3% of the WHO's funding.
Trump's withdrawal from the WHO is not unexpected. He took steps to quit the body in 2020, during his first term as president, accusing the WHO of aiding China's efforts to "mislead the world" about the origins of COVID.
WHO vigorously denies the allegation and says it continues to press Beijing to share data to determine whether COVID emerged from human contact with infected animals or due to research into similar viruses in a domestic laboratory.
Trump also suspended U.S. contributions to the agency, costing it nearly $200 million in 2020-2021 versus the previous two-year budgets, as it battled the world's worst health emergency in a century.
Under U.S. law, leaving the WHO requires a one-year notice period, and the payment of any outstanding fees. Before the U.S. withdrawal could be completed last time, Joe Biden won the country’s presidential election and put a stop to it on his first day in office on Jan. 20, 2021.
Source: Reuters