PREVIEW

United States Marine Corps troops patrol the US-Mexico border area as seen from San Diego, California, as the Defense Department deployed 1,600 active-duty troops to the border during US President Trump's second week in office. US Marine Corps Lt. Gen. Michael Cederholm, commander of the I Marine Expeditionary Force, talks US Marines deployed near the San Ysidro Port of Entry with Tijuana, Baja California, Mexico in the background.