Who is Markwayne Mullin, the New Homeland Security Secretary?

Markwayne Mullin, an Oklahoma senator and former mixed martial arts fighter, is poised to take on a far different arena after President Donald Trump selected him to serve as the next Secretary of Homeland Security.

“I am pleased to announce that the Highly Respected United States Senator from the Great State of Oklahoma, Markwayne Mullin, will become the United States Secretary of Homeland Security,” President Donald Trump wrote Thursday on Truth Social. He added that the current Homeland Security secretary...