In this June 21, 2006, file photo, members of the California National Guard work next to the U.S.-Mexico border fence Wednesday, June 21, 2006, near the San Ysidro Port of Entry in San Diego. President Donald Trump said April 3, 2018, he wants to use the military to secure the U.S.-Mexico border until his promised border wall is built. The Department of Homeland Security and White House did not immediately respond to requests for comment. At the Pentagon, officials were struggling to answer questions about the plan, including rudimentary details on whether it would involve National Guard members, as similar programs in the past have done.

(DENIS POROY / AP)