In this May 8, 2019, file photo, Lee Francis Cissna, director of U.S. Citizenship and Immigration Services, sits for a photo in Laguna Niguel, Calif. President Donald Trump has asked Cisna to resign, leaving yet another vacancy within the Department of Homeland Security. Cissna told staff on Friday, May 24, that his last day would be June 1 (AP Photo/Amy Taxin, File)