U.S. Was Behind On Payments To WHO Before Trump's Cutoff : NPR

In mid-April, when President Trump declared, "Today I'm instructing my administration to halt funding of the World Health Organization," Jimmy Kolker did a double take. "We were already in arrears before he said anything," says Kolker, who was an assistant secretary for global health affairs during the Obama administration.
https://www.npr.org/2020/05/07/850326053/u-s-was-behind-on-payments-to-who-before-trumps-cutoff