WASHINGTON, Oct. 18 -- Federal agents kept Rep. Ilhan Omar from contacting her lawyer for more than an hour after they began searching her Washington home, her attorneys allege, even though she and her counsel were supposed to be handed a copy of the warrant at the outset.

The claim sits in an Oct. 16 letter to the Justice Department from Omar's attorneys, Amy Jeffress and Joshua Matz, which CBS News reviewed. The letter accuses the department of violating a magistrate judge's order by failing to follow protocols meant to safeguard her constitutional interests as a member of Congress during the Ilhan Omar home search that Homeland Security Investigations agents carried out on Monday.

The lawyers ask for the immediate return of her prope...