President Trump replaces Kristi Noem with Sen. Markwayne Mullin
President Donald Trump announced on Thursday, March 5, 2026, that he is replacing Homeland Security Secretary Kristi Noem with Oklahoma Senator Markwayne Mullin. According to a statement shared on Truth Social, Noem will transition to a new role as Special Envoy for the Shield of the Americas, while Mullin is set to take over the top spot at DHS effective March 31, 2026.