Trump fires Noem, names Mullin DHS secretary — but the law may block it

KNKristi Noem became the first cabinet secretary fired in Trump's second term on March 5, 2026. Trump announced her removal and named her replacement in a single Truth Social post, with no advance warning to Noem or her staff.

Noem had been one of Trump's most loyal public allies since 2020. Her firing showed he'll cut loose even close allies when they become a political liability.

The immediate trigger was Noem's Senate Judiciary Committee testimony the week before her firing. She confirmed that DHS signed a $220 million no-bid contract with a public relations firm to promote Trump's immigration crackdown. She also confirmed that Trump personally approved the spending.

That admission implicated the president in the very contract senators were grilling her about. It made her presence at DHS untenable.

The committee also pressed Noem about an ICE operation in Minneapolis where agents fatally shot two U.S. citizens. Noem struggled to explain the legal authority for the shootings and couldn't provide a clear account of what happened. The combination of the contract testimony and the Minneapolis questions turned her Senate appearance into a two-day liability for the administration.

Trump named Sen. Markwayne Mullin (R-OK) as Noem's replacement, effective March 31. Mullin is a two-term senator, former House member, and close Trump ally who sits on the Senate Armed Services Committee. He's known for confrontational style. In December 2023, he challenged Teamsters president Sean O'Brien to a physical fight during a Senate hearing.

Trump's announcement framed the transition as straightforward. The law says otherwise.

The Federal Vacancies Reform Act (FVRA) creates a specific legal barrier. Sitting members of Congress can't serve as acting officers for Senate-confirmed executive positions. That means Mullin can't legally run DHS even temporarily while he waits for his confirmation vote.

If Mullin isn't confirmed before March 31, the role goes to DHS Deputy Secretary B'Benjamine 'Bennie' Huffman by default. TBThomas Berry of the Cato Institute said there are 'a couple of reasons' Mullin can't legally serve as acting secretary before confirmation, and that any actions he takes in that capacity could be challenged and voided in court.

Mullin still needs to formally resign his Senate seat, receive an official nomination, and clear a Senate confirmation hearing. The Homeland Security Committee will question him under oath on the $220 million contract, the Minneapolis shootings, and DHS's civil liberties record.

Sen. John Thune (R-SD) said Republicans would move quickly. Sen. John Fetterman (D-PA) broke with Democrats and said he'd vote yes on Mullin, calling him 'a good man.' That bipartisan signal could accelerate the timeline.

Mullin's Senate resignation creates a secondary consequence. 🛢️Oklahoma Gov. KSKevin Stitt (R) must appoint a registered Republican to fill the seat. The seat expires in November 2026, when Mullin's term was already set to end, so no special election is required.

The vacancy temporarily reduces the Senate Republican caucus by one seat during any close votes in the transition window.

The $220 million no-bid contract is the unresolved story underneath the personnel change. No-bid contracts bypass the competitive bidding process that federal procurement law typically requires. DHS awarded this one to promote the administration's own immigration enforcement — a political communications function funded with taxpayer money.

Neither Noem's firing nor Mullin's nomination answers who selected the contractor, who approved the terms, or whether the spending was legal. Those questions will land in Mullin's lap at his confirmation hearing.