On March 9 in New York, U.S. diplomats in a closed-door meeting warned key U.N. members, including wealthy donors from Europe, Japan, and South Korea, to “expect a big financial constraint” on U.S. spending at the United Nations, said one European diplomat. “There are rumors of big cuts to the State Department budget, but again, on our side, no figures,” the diplomat said.

The cuts would fall heaviest on U.N. programs, like peacekeeping, UNICEF, and the U.N. Development Programme, that are funded out of the budget of the State Department’s Bureau of International Organization Affairs. It remains to be seen whether other U.N. agencies popular with Congress, like the World Food Programme and U.N. refugee operations — which are funded out of separate accounts in the U.S. Department of Agriculture and the State Department, respectively — will get hit as hard. But one source tracking the budget proposal said the Trump administration is considering cuts of up to 36 percent on humanitarian aid programs.

Richard Gowan, a U.N. expert at the European Council on Foreign Relations, said cuts of this magnitude would create “chaos.”