WASHINGTON, DC - MARCH 05: U.S. Sen. Markwayne Mullin (R-OK) speaks to reporters outside of the U.S. Capitol Building on March 05, 2026 in Washington, DC. Earlier today U.S. President Donald Trump announced on Truth Social his intention to nominate Mullin to replace U.S. Secretary of Homeland Security Kristi Noem. (Photo by Anna Moneymaker/Getty Images) Anna Moneymaker/Getty Images North America hide caption

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Anna Moneymaker/Getty Images North America

President Trump announced Thursday that he has chosen Sen. Markwayne Mullin, R-Okla., to be the next Secretary of Homeland Security.

If confirmed, Mullin would replace Kristi Noem, who has led the agency through a broad and controversial crackdown on immigration in the country. Trump announced the decision in a post on Truth Social.

"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.…