An estimated 1,900 troops are being deployed in D.C. More than half are coming from Republican-led states. Besides Union Station, they've mostly been spotted around downtown areas, including the National Mall and Metro stops.

Protesters booed and jeered Vice President JD Vance, Defense Secretary Pete Hegseth and White House deputy chief of staff Stephen Miller as they came to the station, located blocks from the U.S. Capitol, to thank the troops. The crowd's chants drowned out the voices of the officials.

The moves come as federal agents and National Guard troops have begun to appear across the heavily Democratic city after President Trump's executive order.