Rep. Ilhan Omar’s attorneys have demanded the immediate return of property seized from her Washington home, arguing that federal agents’ search this week was neither justified nor lawful. The request marks the latest escalation in an immigration-fraud investigation targeting the Minnesota Democrat, who is running for reelection just weeks before the midterm vote.

The legal demand, reported by The Associated Press from a letter obtained Friday, comes after Homeland Security Investigations searched Omar’s residence under a court-authorized warrant. Her lawyers described the operation as an effort to target a prominent political opponent and questioned the government’s legal basis for taking her belongings. No public charging document has established that Omar committed immigration or citizenship fraud.

Homeland Security Secretary Markwayne Mullin offered a sharply different characterization on Friday. In an interview reported by CBS News, Mullin called the investigation a “strong case,” said agents executed multiple search warrants on the same day and indicated that prosecutors expected to present evidence to a grand jury. His comments supplied the administration’s clearest public defense of the operation since the search became known.

The investigation has gained national attention because reports have linked it to an effort to determine whether Omar’s citizenship could be challenged and whether deportation proceedings could eventually be pursued. Omar was born in Somalia, became a U.S. citizen and now serves in Congress; any attempt to denaturalize her would require a formal legal process and judicial scrutiny. Reporting has not shown that such a process has begun.

The timing has also intensified questions about political pressure on federal law enforcement. Omar has been a longtime critic of President Donald Trump, while Trump and senior immigration officials have repeatedly attacked her publicly. The supplied Truthout report focused on Senate Minority Leader Chuck Schumer’s lack of a public defense of Omar; the newest development is more concrete: Omar’s legal team is now challenging the seizure itself as federal officials say the case is moving toward possible grand-jury review.