US President Donald Trump on Thursday announced that Senator Markwayne Mullin will become the next United States Secretary of Homeland Security, with the appointment set to take effect on March 31, 2026. The announcement was made through a post on Truth Social, where Trump also revealed that the current secretary, Kristi Noem, will transition to a new role as special envoy for a forthcoming regional security initiative known as “The Shield of the Americas.” According to the pres