Who is Markwayne Mullin, Trump’s new homeland security chief?

Markwayne Mullin, a Trump loyalist and former MMA fighter, has been appointed as the new head of the US Department of Homeland Security, as reported on March 24, 2026. Mullin is the first Native American to hold this position. He will be responsible for overseeing homeland security operations within the United States. His appointment comes at a time when the Trump administration is focused on implementing stricter policies regarding migrants. The Department of Homeland Security is the federal agency tasked with border security, immigration enforcement, and disaster response, among other responsibilities.