Mullin Confirmed to Lead DHS, Head Trump Immigration Efforts

Markwayne Mullin arrives for the final Senate vote on his nomination to be Secretary of Homeland Security, on March 23.Photographer: Francis Chung/Politico/AP Photo

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By Alicia Diaz and Caitlin Reilly

March 24, 2026 at 12:25 AM UTC

Updated on

March 24, 2026 at 1:41 AM UTC

Markwayne Mullin was confirmed Department of Homeland Security secretary, placing the Oklahoma senator in charge of a Trump administration immigration crackdown that has triggered a 37-day funding shutdown of the cabinet agency.

The Senate voted 54-45 mostly along party lines Monday to confirm Mullin, a first-term Republican senator and former mixed martial arts fighter who has been a staunch defender of Donald Trump’s deportation campaign.