Mullin, a Trump ally, replaces Kristi Noem, who was fired earlier this month for her role in the large-scale operation against undocumented migrants in Minnesota.

President Donald Trump tapped Sen. Markwayne Mullin, R-Okla., earlier this month to replace embattled DHS Secretary Kristi Noem.

President Trump tapped Mullin, a first-term Oklahoma GOP senator, to replace Kristi Noem as homeland security secretary earlier this month.