White House Press Secretary Karoline Leavitt said Tuesday the first flights of undocumented immigrants from the U.S. to Guantánamo Bay in Cuba were underway—following an escalation of arrests across the country as part of what President Donald Trump has promised would be the “largest deportation operation” in U.S. history.

The White House has confirmed the arrival of the first deportation flights from the U.S. at Guantanamo Bay. The plan calls for as many as 30,000 people to be sent there. CBS News Pentagon reporter Eleanor Watson has more.