Markwayne Mullin His workout routines, bold stylistic choices, and brash manner have made Markwayne Mullin a memorable member of Congress. (more) Markwayne Mullin United States senator Written by Nick Tabor Nick Tabor is a freelance journalist and the author of Africatown: America's Last Slave Ship and the Community It Created. Nick Tabor Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Mar. 13, 2026 •History Markwayne Mullin is a Republican U.S. senator from Oklahoma and U.S. Pres. Donald Trump’s choice to become the next secretary of the U.S. Department of Homeland Security (DHS). During his time in Congress—first in the House of Representatives (2013–2023) and then in the Senate (2023– )—he has drawn attention for his hot temper and unpolished manner. A former mixed martial arts fighter, he once challenged the president of the Teamsters Union to a fight during...

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