Oklahoma Gov. Kevin Stitt on Tuesday chose energy executive Alan Armstrong to fill Sen. Markwayne Mullin's seat through the end of year.

With the help of two Democrats, the Senate confirmed Markwayne Mullin to replace Kristi Noem as the head of the Department of Homeland Security.

The Senate is on track to confirm Markwayne Mullin as homeland security secretary, President Donald Trump's nominee to take over the embattled department after firing Kristi Noem amid a public backlash over the administration's immigration enforcement and mass deportation operations.

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

The Senate voted to confirm Markwayne Mullin to lead the Department of Homeland Security, replacing Kristi Noem as DHS is shutdown leading to airport delays and lines.

The Senate on Monday confirmed Republican Sen. Markwayne Mullin of Oklahoma to lead the Department of Homeland Security, replacing Kristi Noem.

The Senate has voted to confirm President Trump’s pick, Sen. Markwayne Mullin, R-Okla., to lead the Department of Homeland Security. NBC News’ Sahil Kapur reports on the Senate vote.

President Donald Trump’s pick to replace Kristi Noem as the next Secretary of Homeland Security coasted through his Senate confirmation, despite the intense challenges the department is facing. Former MMA fighter,