What Happened to Markwayne Mullin?
Markwayne Mullin, a Republican from Oklahoma, transitioned from serving in the U.S. House of Representatives and then the U.S. Senate to becoming the ninth United States Secretary of Homeland Security in March 2026 under President Donald Trump. He currently leads the Department of Homeland Security, navigating complex issues including border security, immigration enforcement, and departmental funding.
Quick Answer
Markwayne Mullin currently serves as the ninth United States Secretary of Homeland Security, a position he assumed in March 2026 after being nominated by President Donald Trump and confirmed by the Senate. Prior to this cabinet role, Mullin represented Oklahoma in the U.S. Senate from 2023 to 2026 and in the U.S. House of Representatives from 2013 to 2023. As DHS Secretary, he has been actively involved in addressing immigration policies, border security, and departmental budget matters, facing scrutiny and testifying before congressional committees in mid-2026.
📊Key Facts
📅Complete Timeline14 events
Born in Tulsa, Oklahoma
Markwayne Mullin was born in Tulsa, Oklahoma.
Took over family plumbing business
Mullin assumed control of his family's plumbing business, Mullin Plumbing, which he expanded into a large regional service company.
Elected to U.S. House of Representatives
Mullin was elected as a Republican to represent Oklahoma's 2nd Congressional District in the U.S. House, defeating Democratic candidate Rob Wallace.
Sworn into U.S. House of Representatives
Mullin began his first term in the U.S. House of Representatives.
Elected to U.S. Senate
Mullin won a special election to succeed Senator Jim Inhofe, who resigned before the end of his term.
Sworn into U.S. Senate
Mullin took the oath of office as the junior U.S. Senator from Oklahoma.
Confrontation with Teamsters President Sean O'Brien
During a Senate HELP Committee hearing, Mullin publicly challenged Teamsters president Sean O'Brien to a physical fight.
Nominated as Secretary of Homeland Security
President Donald Trump announced Mullin as his nominee to replace Kristi Noem as the ninth Secretary of Homeland Security.
DHS Secretary Confirmation Hearing
Mullin testified before the Senate Homeland Security and Governmental Affairs Committee, facing questions on his temperament and immigration policies.
Committee Advances DHS Nomination
The Senate Homeland Security and Governmental Affairs Committee voted 8-7 to advance Mullin's nomination to the full Senate.
Confirmed as DHS Secretary and Resigns from Senate
The Senate confirmed Mullin as Secretary of Homeland Security by a 54-45 vote, and he resigned his Senate seat.
Sworn in as Secretary of Homeland Security
Mullin was sworn into office by Attorney General Pam Bondi, becoming the first Cherokee Nation citizen in a Cabinet role. Oklahoma Governor Kevin Stitt appointed Alan Armstrong to fill Mullin's vacant Senate seat.
Testifies before Senate on DHS Budget and Policies
Secretary Mullin faced questioning from Democrats in a heated Senate hearing regarding DHS budget, immigration enforcement, and threats to pull officers from 'sanctuary cities'.
SCOTUS Rules in 'Mullin v. Doe' and Testifies Before House
The Supreme Court sided with the Trump administration in 'Mullin v. Doe', a case concerning the termination of Temporary Protected Status for Syrian and Haitian nationals. On the same day, Mullin testified before the House Appropriations Committee.
🔍Deep Dive Analysis
Markwayne Mullin's political career has seen a rapid ascent from a successful businessman to a key cabinet position in the U.S. government. Born in Tulsa, Oklahoma, in 1977, Mullin took over his family's plumbing business in 1998, expanding it significantly, and also had a career as a professional mixed martial arts fighter. An enrolled member of the Cherokee Nation, he is a prominent Native American voice in national politics.
Mullin first entered national politics during the Tea Party movement, winning election to the U.S. House of Representatives for Oklahoma's 2nd Congressional District in 2012. He served five terms, from 2013 to 2023, building a reputation as a staunch conservative. In 2022, he successfully ran in a special election to fill the U.S. Senate seat vacated by Jim Inhofe, taking office in January 2023.
During his time in the Senate, Mullin gained attention for his outspoken style and close alliance with President Donald Trump. Notably, he engaged in a heated exchange with Teamsters president Sean O'Brien during a Senate hearing in November 2023, even threatening to fight him. He also served on key committees, including Armed Services, Environment and Public Works, and Indian Affairs.
A significant turning point in Mullin's career occurred in March 2026 when President Donald Trump nominated him to succeed Kristi Noem as the Secretary of Homeland Security. His confirmation hearing on March 18, 2026, was contentious, with Senator Rand Paul criticizing Mullin's temperament and past comments. Despite the pushback, the Senate Committee on Homeland Security and Governmental Affairs advanced his nomination on March 19, 2026. The full Senate confirmed Mullin on March 23, 2026, in a 54-45 vote, largely along party lines, with two Democrats supporting and one Republican opposing. He resigned from the Senate the same day and was sworn in as DHS Secretary on March 24, 2026, becoming the first Cherokee Nation citizen to serve in a U.S. Cabinet position.
As of June 2026, Secretary Mullin is actively leading the Department of Homeland Security amidst various challenges. He has testified before Senate and House committees regarding the DHS budget and immigration policies, including controversial threats to pull officers from 'sanctuary cities' airports. On June 25, 2026, the Supreme Court ruled in 'Mullin v. Doe,' a case concerning the Trump administration's efforts to terminate Temporary Protected Status (TPS) for Syrian and Haitian nationals, with the court siding with the administration. Mullin continues to advocate for secure borders and stricter immigration enforcement, aligning with President Trump's agenda.
What If...?
Explore alternate histories. What if Markwayne Mullin made different choices?