Homeland Security Secretary Kristi Noem attends a meeting in the Oval Office on Nov. 17, 2025. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images

President Trump fired Homeland Security Secretary Kristi Noem and said Republican Sen. Markwayne Mullin of Oklahoma would replace her.

Noem "will be moving to be Special Envoy for The Shield of the Americas, our new Security Initiative in the Western Hemisphere we are announcing on Saturday in Doral, Florida," Trump posted on social media . "I thank Kristi for her service at 'Homeland.'"

Noem is the first Cabinet secretary to leave the Trump administration in Trump's second term.…