Trump taps Sen. Markwayne Mullin as new Homeland Security chief

President Donald Trump announced a major shakeup in his homeland security leadership Thursday, naming Senator Markwayne Mullin of Oklahoma as the next Secretary of Homeland Security. In a post on his Truth Social platform, Trump revealed that Mullin will assume the position effective March 31, 2026, replacing incumbent Kristi Noem in a move that reshapes the administration's approach to border security and immigration enforcement.

Noem transitions to new Western Hemisphere role

Trump confirmed that Noem will not be leaving the administration but will instead take on a new assignment as special envoy for "The Shield of the Americas," a security initiative focused on the Western Hemisphere. The president indicated the program will be formally unveiled Saturday in the state of Florida, suggesting a continued emphasis on regional security cooperation and the administration's broader hemispheric strategy.

Mullin tasked with border enforcement priorities

In announcing Mullin's appointment, Trump highlighted both the senator's political record and personal background, outlining clear expectations for his tenure. "Markwayne will work tirelessly to Keep our Border Secure, Stop Migrant Crime, Murderers, and other Criminals from illegally entering our Country, End the Scourge of Illegal Drugs and, Make America Safe Again," Trump declared, emphasizing the administration's continued focus on restrictive immigration policies and enhanced border enforcement. The president expressed confidence in his choice, adding that "Markwayne will make a spectacular Secretary of Homeland Security."

Noem's departure follows congressional scrutiny

The leadership change comes amid reports that Trump's frustrations with Noem had grown following her congressional testimony earlier this week. The secretary faced internal scrutiny after two American citizens, Alex Pretti and Renee Nicole Good, were killed in Minnesota in January by Immigration and Customs Enforcement agents. The incident prompted Democratic lawmakers to urge Trump to remove Noem, with some even signing onto an impeachment resolution against her. The transition allows the administration to reset its homeland security leadership while retaining Noem's experience in a new role focused on regional security partnerships.