Watch live: Markwayne Mullin sworn in to lead DHS

President Trump will host a swearing-in ceremony Wednesday afternoon for Sen. Markwayne Mullin (R-Okla.), who was confirmed Monday to lead the Department of Homeland Security (DHS). Trump tapped Mullin late last month to replace outgoing Homeland Security Secretary Kristi Noem, who faced criticism over the department's tactics during immigration enforcement operations. The fatal shootings of...