Learn more about what USAID is and how it works after Department of Government Efficiency leader Musk says he and Trump are hoping to shut down the federal agency.

Employees at the U.S. Agency for International Development (USAID) were informed on Monday that their headquarters in downtown Washington was shut for the day, hours after billionaire Elon Musk said President Donald Trump agreed that Washington's primary humanitarian agency should be closed.

USAID, a decades-old organization that provides humanitarian aid to over 130 countries, now faces an uncertain future.