Kristi Noem sat before the United States Senate and told them Donald Trump approved her $220 million ad campaign.
He didn't.
And the moment Trump found out she said that under oath, it was over.
Kristi Noem Fired: The $220 Million Ad Campaign That Cost Her the Job
Sen. John Kennedy had spoken with Trump directly after Tuesday's hearing and put it plainly to reporters: the president was "mad as a murder hornet."
A White House official confirmed it in starker terms: "POTUS did not sign off on a $220 million dollar ad campaign. Absolutely not."
Trump told Reuters the same thing: "I never knew anything about it."
That was Strike One – and it was enough on its own.
But the ad campaign had been a problem before the testimony made it radioactive.
Noem authorized a massive border security ad blitz through contracts awarded to firms with political ties to her inner circle – in one case, a company incorporated just 11 days before she selected them.
Kennedy had already made this point at the hearing, noting that a quarter of a billion dollars of taxpayer money moved without competitive bidding, with Noem's face front and center throughout.
"Well, they were effective in your name recognition," Kennedy told her after she defended the ads as "extremely effective."
That was Strike Two.
Strike Three had been building since January.
During the Minneapolis immigration enforcement surge, two American citizens – Renee Good and Alex Pretti – were shot and killed by federal agents.
Noem's response was to publicly call them domestic terrorists before any investigation had concluded.
Republican senators were furious.
Sen. Thom Tillis – who had voted to confirm her – called her tenure "a disaster" at the March 3 Senate Judiciary hearing and threatened to block every one of Trump's nominations until she answered for it.
Lisa Murkowski, Bill Cassidy, Pete Ricketts, Ted Cruz, Jerry Moran – the roster of Republicans demanding her resignation or calling for investigations was long enough to constitute a political death sentence.
And threaded through all of it were the undenied rumors of an affair with Corey Lewandowski.
At the House Judiciary Committee hearing the day before her firing, a Democratic congresswoman asked Noem under oath whether she had "sexual relations" with her top adviser.
Noem called it "tabloid garbage" – but she never said no.
Sources close to Trump told Fox News's Jacqui Heinrich that the affair allegations were baked into the final assessment: a source described her ouster as "a combination of her many unfortunate leadership failures, from Minnesota to the ad campaign, to the allegations of an affair."
Who Is Markwayne Mullin and Why Trump Picked Him for DHS Secretary
Trump announced the replacement on Truth Social, calling Sen. Markwayne Mullin of Oklahoma a "MAGA Warrior" – and he chose that description deliberately.
Mullin went undefeated in professional MMA before entering politics, spent a decade in the House, and has built a reputation in the Senate as one of Trump's most effective television surrogates.
That last point mattered more than it might sound.
Trump has called Mullin after cable news appearances to praise his performance.
White House aides have regularly dispatched him for high-stakes media moments.
Where Noem increasingly became a liability on camera – cornered, defensive, refusing to answer direct questions – Mullin is someone who walks into a hearing and punches back.
His immigration record is unimpeachable from a MAGA standpoint.
He defended the federal officer who shot Renee Good in Minneapolis, saying the officer "had the right to defend himself."
He called the ongoing DHS shutdown – caused by Democrats refusing to fund the department – "political theater."
When Trump announced the nomination, Democrat Sen. John Fetterman broke from his party immediately: an unambiguous "AYE."
Karoline Leavitt said the administration would work to confirm Mullin "as quickly as possible."
Trump's Immigration Agenda Continues Without Kristi Noem
The deportation mission doesn't pause for personnel changes.
DHS removed 605,000 people during Noem's tenure – a record – and holds a historic high number of people in immigration detention.
None of that saved her.
What ended her career wasn't the mission.
It was the theater she built around herself while executing it – the horseback photo ops, the self-promotional ad blitz, the adviser she couldn't keep out of the headlines, the testimony that put her directly at odds with the president in public.
A White House official framed it plainly: "Kristi's drama sadly overshadowed and distracted from the Administration's extremely popular immigration agenda."
Trump had five DHS secretaries in his first term.
He knows how to make the swap without breaking stride.
Mullin takes over March 31.
The border stays closed.
And this time, Trump picked someone whose name recognition doesn't require a Mount Rushmore backdrop to earn it.
Sources:
- Jacqui Heinrich, "FNC's Heinrich: Noem Firing A Culmination Of Leadership Failures In Minnesota, Ad Campaign, And Infidelity Allegations," Fox News / RealClearPolitics, March 5, 2026.
- "Trump taps Sen. Markwayne Mullin after firing Kristi Noem as DHS secretary," CNBC, March 5, 2026.
- "Sen. Markwayne Mullin announced as new DHS secretary replacing Kristi Noem: What we know about him," NewsNation, March 5, 2026.
- "What led Trump to replace Kristi Noem," NBC News, March 5, 2026.
- "Luxe jets, blankies, Lewandowski: Noem's Day 2 hearing left little to imagination," Fox News, March 5, 2026.
