Congressional Democrats are protesting President Donald Trump’s efforts to shutter a federal humanitarian aid agency, calling the move illegal as Republicans give the new administration leeway. Democrats attempted to enter the closed headquarters of the U.

The developments come after thousands of USAID employees already have been laid off and programs shut down in the two weeks since Trump became president.

The move would require Senate Majority Leader John Thune to use precious floor time to advance the president’s nominees through the confirmation process.