Who is Markwayne Mullin, named by Trump to replace Kristi Noem as Homeland Security secretary?

By Michael Williams, CNN (CNN) — President Donald Trump on Thursday announced he was ousting Department of Homeland Security Secretary Kristi Noem, and that GOP Sen. Markwayne Mullin of Oklahoma would replace her. Mullin, a first-term senator who has served in that role since 2023, is a former mixed-martial artist and business owner who is