Washington — President Trump announced Thursday that Department of Homeland Security Secretary Kristi Noem would leave her role later this month after she's faced intense criticism that came to a crescendo this week, and he announced her replacement."I am pleased to announce that the Highly Respected United States Senator from the Great State of Oklahoma, Markwayne Mullin, will become the United States Secretary of Homeland Security (DHS), effective March 31, 2026," Mr. Trump said in a post on Truth Social. The Senate would need to confirm Mullin to the post. The president said Noem "has served us well," citing her "spectacular results" on the border. He said she will be moving to a role as special envoy for The Shield of the Americas, a new security initiative he said the administration will be unveiling.…