Federal immigration agents searched Democratic Representative Ilhan Omar's Washington, DC-area home on Monday as part of an ongoing criminal investigation, prompting accusations of political intimidation weeks before the November 3 midterm elections.
The Justice Department confirmed that Homeland Security Investigations agents executed a judicially authorised search warrant but declined to disclose the investigation's nature or whether Omar faces any allegations.
No charges have been announced.
The Associated Press reported that agents conducted the search early Monday, while BBC journalists observed officers carrying boxes from the property.
Fox News, citing unidentified sources, linked the investigation to immigration paperwork submitted by Omar's late father during her childhood, although authorities have not confirmed that account.
Omar, a Somali-born naturalised American citizen representing Minnesota's Minneapolis area, rejected the search as politically motivated.
Her communications director, Jacklyn Rogers, maintained that the congresswoman had committed no wrongdoing.
The operation follows months of allegations concerning Omar's immigration history.
White House border official Tom Homan previously acknowledged an investigation into unspecified immigration violations, while Homeland Security Secretary Markwayne Mullin separately raised allegations of marital fraud.
Omar has consistently denied wrongdoing and dismissed the investigations as politically motivated.
The search occurred 22 days before the midterm elections, intensifying Democratic concerns about potential political interference.
House Democratic leaders condemned the operation, citing Trump's longstanding attacks against Omar and questioning its timing.
Minnesota Governor Tim Walz accused Trump of abusing presidential authority, while Senator Tina Smith characterised the search as an attempt to influence the elections.
Republican Representative Tom Emmer defended the importance of accountability and welcomed further information about the investigation.
Trump has repeatedly criticised Omar and Minnesota's Somali-American community, including making remarks suggesting that the congresswoman should leave the United States.
The Justice Department maintains longstanding restrictions against investigative actions that could appear intended to influence elections.
Authorities have not publicly explained the investigation's scope, leaving unresolved questions about its basis and the timing of the search.