Updated at 3:49 p.m. ET
President-elect Joe Biden's nominee to head the Department of Homeland Security, Alejandro Mayorkas, appeared before a Senate panel Tuesday to begin his confirmation process, vowing to do everything he can so that an attack on the Capitol like the one on Jan. 6 "will not happen again."
Mayorkas, who would be the first Latino and first immigrant to lead that department, was previously the head of U.S. Citizenship and Immigration Services, a DHS agency, during the Obama administration. He then served as deputy secretary of DHS.