Trump replaced Kristi Noem as secretary of the Department of Homeland Security after lawmakers grilled her over an ad campaign that featured her.

Oklahoma Republican Sen. Markwayne Mullin says he has no idea how quickly his nomination to replace Kristi Noem at the Department of Homeland Security will move.

Homeland Security Secretary Kristi Noem is stepping down at the end of the month, President Donald Trump said Thursday, saying that he would tap Sen. Markwayne Mullin, R-Okla., to replace her. NBC News' Peter Alexander,

Embattled Homeland Security Secretary Kristi Noem was fired by President Donald Trump. He has nominated Oklahoma Republican Sen. Markwayne Mullin in her place.

Fox News' John Roberts, Sandra Smith and Jacqui Heinrich provide details on President Donald Trump's move to fire Homeland Security Sec. Kristi Noem and tap Sen. Markwayne Mullin, R-Okla., as her replacement.

Kristi Noem publicly responded to her new assignment as special envoy for the Shield of the Americas via X, thanking Trump and highlighting what she described as “historic accomplishments” during her 13 months leading the Department of Homeland Security,

US President Donald Trump has announced he is replacing Homeland Security Secretary Kristi Noem Noem, who has led Trump's immigration drive, will be replaced with Republican Senator Markwayne Mullin,

In a post on social media, President Trump announced that Homeland Security Secretary Kristi Noem would be stepping down and Sen. Markwayne Mullin, R-Okla., would be nominated to replace her.