The World Health Organization chief asked global leaders to lean on Washington to reverse President Donald Trump’s decision to withdraw from the U.N. health agency, insisting in a closed-door meeting with diplomats last week that the U.S. will miss out on critical information about global disease outbreaks.

For 2024-2025, the U.S. is WHO’s biggest donor by far, putting in an estimated $988 million, roughly 14% of WHO’s $6.9 billion budget.

A budget document presented at the meeting showed WHO’s health emergencies program has a “heavy reliance” on American cash. “Readiness functions” in WHO’s Europe office were more than 80% reliant on the $154 million the U.S. contributes.