President Trump named Oklahoma Sen. Markwayne Mullin as the next Secretary of Homeland Security, replacing Kristi Noem.

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

Noem's firing comes after a controversial tenure at DHS with nationwide protests, a partial government shutdown and a divisive ad campaign.

U.S. Senator Markwayne Mullin (R-OK), tapped by U.S. President Donald Trump to replace U.S. Homeland Security Secretary Kristi Noem, gets into his car as he departs the U.S. Capitol after a vote in the U.

Democratic lawmakers said Stephen Miller and Pam Bondi should be next after President Donald Trump announced Kristi Noem would be stepping aside as DHS secretary.

President Trump tapped Oklahoma Sen. Markwayne Mullin as the next Secretary of Homeland Security, replacing Kristi Noem.

President Donald Trump has grown frustrated with Homeland Security Secretary Kristi Noem and has begun to consider possible replacements, lawmakers and people familiar with the discussions tell NBC News.

President Donald Trump said Thursday on social media he was firing Homeland Security Secretary Kristi Noem and would name Oklahoma Sen. Markwayne Mullin to replace her.