Ilhan Omar is once again at the center of one of the most explosive allegations in American politics.
This time, the accusation is coming directly from the nation’s Homeland Security secretary.
Markwayne Mullin claimed Thursday that federal investigators are examining longstanding allegations that the Minnesota congresswoman married a man who was actually her brother as part of an immigration-fraud scheme.
Omar has repeatedly and emphatically denied that claim.
No court has established that she married her brother, and the allegation remains disputed.
But Mullin went further than merely repeating it.
He suggested that if investigators uncover immigration fraud serious enough to undermine the legitimacy of Omar’s citizenship or original immigration status, deportation could theoretically become part of the case.
“We know that she married her brother to try to bring him to the United States,” Mullin told conservative podcaster Benny Johnson at the Republican midterm convention in Dallas.
That assertion has not been proven in court.
Mullin himself acknowledged that the investigation remains ongoing.
He said authorities must ensure that any case advanced against Omar is based on evidence rather than politics.
“If we actually move a case forward, it’s not a political case,” Mullin said. “It’s an actual case, because they did things wrong.”
The allegation centers on Omar’s former husband, Ahmed Nur Said Elmi, a British citizen whom Omar legally married in 2009.
Critics have claimed for years that Elmi was actually Omar’s brother and that the marriage was designed to help him obtain immigration benefits.
Omar has called that accusation “absurd and offensive.”
“Insinuations that Ahmed Nur Said Elmi is my brother are absurd and offensive,” she said when the allegations gained national attention in 2016.
Her office has continued to dismiss the story as a politically motivated conspiracy.
Yet the claim has never completely disappeared.
Trump and Vice President JD Vance have both publicly repeated it.
Now Mullin is saying federal authorities are actively investigating whether immigration laws were broken.
The legal stakes could be enormous — but the process would be far more complicated than simply ordering a sitting congresswoman out of the country.
Omar became a naturalized U.S. citizen in 2000 when she was 17.
Generally, a naturalized citizen cannot simply be deported because an administration accuses them of wrongdoing.
The government would first need to establish a legal basis to revoke, or “denaturalize,” citizenship — typically by proving that citizenship was illegally obtained or procured through material fraud or misrepresentation.
Only after citizenship was successfully revoked could removal proceedings potentially follow.
Mullin appeared to acknowledge that evidentiary burden.
“If you lied about certain things about your application, there’s no expiration to that,” he said.
“If we can prove it — that you shouldn’t have been here in the first place — we’ll deport you.”
That “if” is crucial.
Omar’s citizenship has not been revoked.
She has not been convicted of marriage fraud.
And nothing publicly available establishes as fact that Elmi was her brother.
The history behind the allegation is complicated.
Omar legally married Elmi in 2009.
She later described the relationship as brief and said they had separated.
Their marriage was legally dissolved in 2017.
A month later, in January 2018, Omar legally married Ahmed Abdisalan Hirsi, with whom she had already had a longstanding relationship and children.
Over the years, critics have pointed to deleted social-media posts, claims from members of the Somali community and unusual aspects of Omar’s marital timeline as reasons to question her account.
A Somali community figure, Abdihakim Osman, told the Daily Mail in 2020 that Omar had introduced Elmi as her brother years earlier and allegedly said he needed immigration “papers.”
That account has never been tested in court.
Other claims first circulated on anonymous Somali political forums.
Some posts cited as evidence were later deleted.
That has left the controversy in an unusual position.
There have been persistent allegations.
There have been public statements by political figures.
There have been circumstantial claims.
But there has not been a judicial finding proving that Omar married a sibling.
That difference is important as the Trump administration intensifies scrutiny.
The issue is also highly politically charged.
Omar is one of the most prominent progressive Democrats in Congress and one of Trump’s most frequent targets.
The Somali-born lawmaker has repeatedly clashed with the president over immigration, foreign policy, Israel and the administration’s enforcement policies.
Her chief of staff earlier this year dismissed renewed marriage-fraud allegations as a distraction from Trump’s political troubles.
The administration argues the opposite.
Mullin insists that investigators are pursuing possible violations regardless of Omar’s political position.
His comments also come as DHS ramps up a much broader immigration enforcement campaign.
The department says more than 2,000 people identified by authorities as known or suspected terrorists have been deported since Trump returned to office, highlighting the administration’s increasingly aggressive approach to immigration enforcement.
Mullin has also publicly described DHS as operating in an intensified security environment and has defended expansive enforcement policies throughout 2026.
Whether that broader crackdown ultimately reaches a sitting member of Congress remains an entirely different question.
For now, the case against Omar remains an investigation — not a conviction.
Mullin has made a dramatic accusation.
Omar has categorically denied it.
And until investigators produce evidence capable of surviving legal scrutiny, the central allegation remains unresolved.
But for the first time, one of the country’s most powerful immigration officials is openly saying what could happen if the government believes it can prove the case.
Not merely political embarrassment.
Not merely another congressional controversy.
Potentially the most serious immigration consequence imaginable:
Loss of citizenship followed by deportation.