On October 12, Homeland Security Investigations agents executed what the Justice Department called a "judicially authorized search warrant" at Rep. Ilhan Omar's Washington, D.C.-area home as part of an ongoing federal criminal investigation, three weeks before the midterm elections.

Sources told ABC News the probe relates to Omar's immigration paperwork. Agents were seen carrying boxes marked "Seized Property Evidence," and Omar's attorneys say items including her phone were taken.

No charges have been announced.

The New York Post reports that federal prosecutors plan to use DNA evidence, along with whistleblowers and government records, to try to substantiate decade-old allegations that Omar committed immigration fraud, including the claim that she married Ahmed Nur Said Elmi in 2009 to help him obtain a green card.

The Post also reports that sources say the October 12 search warrant, the DNA and additional evidence give prosecutors a basis to bring conspiracy charges before a grand jury.

Border czar Tom Homan said over the weekend that investigators have built a "strong case," telling interviewers the evidence will lead where it leads.

The search came just 22 days before the November 3 midterms, when Omar is up for reelection in Minnesota's 5th District, and it broke with the Justice Department's longstanding practice of avoiding overt investigative steps against members of Congress within 60 days of an election.

Omar called the search "an attempt to target political enemies and weaponize federal law enforcement," writing "I will not be silenced."

Her attorneys accused the DOJ of flouting a magistrate judge's special requests and demanded the return of seized property, which a DOJ spokesperson called a "publicity play."

Former President Barack Obama publicly condemned the probe on Sunday, calling it "appalling" and writing that "the full weight of the federal government is being brought down on a law-abiding elected official because she has dared to criticize the president."

House Democratic leaders Hakeem Jeffries, Katherine Clark and Pete Aguilar issued a joint statement calling the search "deeply disturbing," while Governor Tim Walz accused Trump of abusing power to go after political opponents.

Trump denied personal involvement while calling Omar a "terrible person," and Vice President JD Vance said there are "serious allegations" investigators will follow.

The core allegations concern immigration paperwork: whether Omar's late father misreported her age or birth date on documents submitted when she naturalized in 2000, and whether her 2009 marriage to Elmi was fraudulent.

Omar has repeatedly denied the sibling-marriage claim since 2016, calling it "disgusting lies," and her lawyers say there is "no legitimate basis" for questioning her citizenship.

According to the New York Post, the Washington Post reported that a former immigration official said the marriage allegation was probed during the first Trump administration and yielded insufficient evidence.

The investigation remains open, and investigators have issued more than a dozen grand jury subpoenas, including to some of Omar's relatives, suggesting a broader inquiry than the home search alone.

Omar's legal team argues a conspiracy charge could reach conduct outside normal statute-of-limitation windows, a route the New York Post says sources expect. Denaturalization and deportation of a sitting member of Congress would be an unprecedented move by the DOJ.