Donald Trump on Thursday said Republican Sen. Markwayne Mullin will replace Kristi Noem as Department of Homeland Security secretary.

Trump made the announcement on social media Thursday afternoon saying he was “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 (DHS), effective March 31, 2026.”

The sources said the president was upset with a particular moment during the hearing when Republican Sen. John Kennedy questioned Noem about a taxpayer-funded $220 million ad campaign. Noem repeatedly suggested the president was aware of the campaign and signed off on it.