Trump provided few details but said it would house "the worst criminal illegal aliens threatening the American people." He announced the move during a bill signing ceremony at the White House for the Laken Riley Act,

Joyce Vance warned that Trump's move could ignite a "constitutional confrontation" between government branches.

Congressional Democrats and good-government groups say President Donald Trump's Monday night directive to pause the distribution of trillions of dollars in federal grants and loans represents an immense power grab that would upend the constitutional separation of powers between different branches of government.

Donald Trump's effort to freeze trillions of dollars in federal grants is the most provocative of his many attempts to expand his power in the first days of his presidency