What to Know About Markwayne Mullin, Trump’s Pick to Replace Noem as DHS Head

The Oklahoma senator will replace Department of Homeland Security Secretary Kristi Noem on March 31, the president said.

Sen. Markwayne Mullin (R-Okla.) speaks to members of the media on Capitol Hill in Washington on March 3, 2026. Madalina Kilroy/The Epoch Times

Sen. Markwayne Mullin (R-Okla.) has been tapped to head up the Department of Homeland Security (DHS) after President Donald Trump on Thursday fired DHS Secretary Kristi Noem from the post.

“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,” Trump wrote in a post on Truth Social.