The United States will make an initial payment toward the billions of dollars it owes to the United Nations in a matter of weeks, the U.S. ambassador to the world body said Friday, while stressing the need for the U.N. to continue reforms.

Mike Waltz made the comments in a telephone interview two weeks after U.N. Secretary-General Antonio Guterres sounded the alarm on U.N. finances and warned that the 193-country organization is at risk of “imminent financial collapse” due to unpaid fees, the majority of which ?are owed by Washington.

“You’ll certainly see an initial tranche of money very shortly,” Waltz said. “It’ll be a significant... down payment on our annual dues.... I ?don’t believe ?that the ultimate figure is decided, but it’ll be in a matter of weeks.”