A confirmation hearing for Oklahoma U.S. Sen. Markwayne Mullin to become Secretary of Homeland Security is scheduled for March 18, as U.S. Rep. Kevin Hern announces plans to run for the Senate seat if it becomes vacant.

Supporters of Sen. Markwayne Mullin say he'll use his well-documented passion to carry out Trump's immigration enforcement agenda.

The Cherokee congressman, who is hard-right and white-passing, may not seem like an Indigenous lawmaker, but he’s no anomaly.

President Donald Trump nominated Sen. Markwayne Mullin (R-OK) to lead the Department of Homeland Security on Thursday, shortly after he removed Kristi Noem from the position. Her firing came a day after yet another contentious hearing before Congress,

In recent weeks, Mullin's comments referencing the "smell of war" in Iran have drawn the public's eye to his military history. Here's what to know.