The Trump administration is sending more than 100 federal officers to a military base outside of San Francisco, a person familiar said, days after President Donald Trump singled out the city as the next target of his federal crime crackdown.

The agents, drawn from US Customs and Border Protection, are expected to begin arriving Thursday at the Coast Guard Base Alameda, in an island just across San Francisco Bay from the city, the person said, asking not to be identified because the information isn’t public.