Trump names Sen. Markwayne Mullin to lead DHS amid qualification backlash

President Donald Trump announced on Truth Social that he has named Oklahoma Republican Sen. Markwayne Mullin to replace Homeland Security Secretary Kristi Noem, saying Mullin will take over the department on March 31, 2026. Trump wrote that Noem will move to a new post as Special Envoy for The Shield of the Americas, a Western Hemisphere security initiative he said will be unveiled in Doral, Florida.

The administration said Mullin can serve as acting secretary but must be confirmed by the U.S. Senate. Mullin told reporters he was “excited” and “ready to get started,” saying “my focus is to keep the homeland secure” and that “it’s an honor to be nominated.” He added, “we’ve still got the nomination process,” acknowledging the Senate hurdle ahead.

Noem, who said she forged “partnerships and national security expertise” during “the last 13 months as Secretary of Homeland Security,” addressed a DHS event after the announcement but did not immediately mention her reassignment. Trump thanked Noem in his post for her service and praised her “numerous and spectacular results (especially on the Border),” framing the change as a reassignment rather than a resignation.

The move comes after a tense period for DHS leadership. Noem was pressed by Democrats during a House Judiciary Committee oversight hearing on March 4 about department tactics and the shooting deaths of two protesters in Minneapolis that have been tied to immigration enforcement actions. The role has been under sustained scrutiny from lawmakers, advocates and communities affected by aggressive enforcement tactics, protests and litigation over agency spending.

Civil rights and immigrant advocates warned the leadership change is unlikely to alter frontline enforcement. Kica Matos, president of the National Immigration Law Center, called the swap “the equivalent of putting lipstick on a pig,” arguing the shift does not address structural harms tied to immigration operations. The Oklahoman reported immigrant advocates expect “little to change” in enforcement under Mullin. Local supporters cited by the Oklahoman offered a contrasting view, with one person identified only as McFerron saying Mullin would get DHS “going in the right direction.”

Critics have also zeroed in on Mullin’s experience. A report supplied to journalists notes Mullin holds an associate degree and lacks national security experience, a characterization cited by opponents who warned of risks to homeland security amid global tensions. That education and experience claim appears in that original report and has not been repeated in all outlet accounts provided with this package.

The personnel shuffle has immediate implications for public health and community wellbeing. Oversight critics say aggressive immigration tactics erode trust in institutions that people rely on for health care, emergency response and disaster assistance, and they point to lawsuits and protests as evidence of community harm. DHS controls agencies such as Immigration and Customs Enforcement that interact directly with vulnerable populations, and leadership instability can complicate continuity of services, public health coordination and oversight of funds Congress has allocated.

Mullin’s recent appearances at national security briefings, including a March 3 session for senators on U.S. strikes on Iran, underscore his new role will intersect with both immigration policy and broader security matters. He will not formally assume the office without Senate confirmation, and the administration’s announcement sets March 31 as the effective date identified in Trump’s posting. The coming weeks will test whether Republican support in the Senate is sufficient to confirm a senator with limited national security credentials into one of the cabinet’s most operationally consequential positions.