More than $13 million in U.S. funding for an international security force helping fight armed gangs in Haiti has been frozen under President Donald Trump's 90-day pause on foreign aid, the United Nations said on Tuesday.

The United States has frozen its financial contributions to a United Nations fund for a multinational security support mission in Haiti, a UN spokesperson said, a move that would stop $13.3 million in pending aid.

The United Nations chief is warning that gangs in Haiti could overrun the capital, Port-au-Prince, leading to a complete breakdown of government authority without additional international support for

United Nations spokesperson Stephane Dujarric said the UN received "an official notification" from the United States asking to immediately stop the contribution for the multinational security support force for Haiti.