3.2 – US Congress
3.1.2 – Key Features of the US Constitution
On 18 March 2026, the Senate Homeland Security and Governmental Affairs Committee convened to examine the nomination of Senator Markwayne Mullin of Oklahoma as the next Secretary of Homeland Security. Trump had announced the nomination earlier in the month after removing Kristi Noem from the post, following sustained bipartisan criticism of her handling of an immigration enforcement surge in Minnesota that resulted in the deaths of two US citizens, and of a $200 million advertising campaign in which she appeared prominently. Noem became the first Cabinet secretary to leave the Trump administration’s second term. Mullin was named as her replacement within days.
Mullin is a Republican senator first elected to the House in 2012, who has built a reputation as one of Trump’s most dependable allies in Congress. A former mixed martial arts competitor, he has presented himself as a Washington outsider and became widely known after challenging the president of the International Brotherhood of Teamsters to a physical altercation during a Senate hearing in 2023. He does not sit on the Homeland Security or Judiciary Committees, the bodies most directly engaged with immigration policy, though he has consistently defended administration positions on enforcement and ICE conduct. His nomination was always likely to generate scrutiny, but the nature of the opening exchange was telling: committee chair Rand Paul, a fellow Republican, used his opening remarks to challenge Mullin directly over reports that he had called Paul a “snake” and expressed sympathy for the neighbour who attacked him in 2017, leaving him with six broken ribs.
The substantive questioning was equally pointed. Senator Gary Peters, the ranking Democrat, criticised the administration’s record at DHS, including cuts to counterterrorism programmes and the weakening of the Cybersecurity and Infrastructure Security Agency. Peters argued that the role demanded steady judgement and relevant experience and expressed concern about whether Mullin’s background prepared him adequately for leading one of the largest government agencies during an unusually turbulent period. With 53 Republican senators, Mullin’s path to confirmation remained straightforward, but the committee indicated it would vote to advance the nomination as early as the following day.
The Mullin hearing offers a timely illustration of the Senate’s confirmation power functioning as a constitutional check on the executive. The process of advice and consent, set out in Article II of the Constitution, ensures that the president cannot fill senior positions unilaterally. What makes this case particularly instructive is that the most pointed challenges came from within Trump’s own party. Rand Paul’s public questioning of Mullin’s temperament, and Republicans’ earlier criticism of Noem during her own oversight hearings, demonstrate that congressional scrutiny is not purely partisan in character. Even where confirmation is a foregone conclusion, the public examination of a nominee’s conduct and judgement serves the purpose the Framers intended: ensuring the executive remains answerable to the legislature.