President Donald Trump is pulling the U.S. out of the World Health Organization for a second time, the White House announced late Monday. The day-one executive order fulfills Trump's campaign promise to reject global institutions.

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.

The WHO is an agency of the United Nations tasked with coordinating responses to public health emergencies between nations. The United States is a founding member of the organization, which was set up in 1948 in the wake of World War II.

In an unexpected move, President Donald Trump has withdrawn the United States from the World Health Organization (WHO). Trump’s rationale blames WHO for a variety of issues. A reporter asked Trump about the importance of WHO,

Public health experts say the United States’ departure could cripple the WHO’s operations or leave an opening for China to assume greater control over the agency.

The exit will cut a huge chunk from the World Health Organization’s budget, but the short-term financial gain for the US could come at the cost of disease outbreaks flaring up across the world.