National Guard troops were allowed back into the Capitol to rest after being asked to move, a request that sent some to a parking garage, officials said.

Senators expressed outrage Thursday evening after Politico reported that Capitol Police had asked the troops to move their rest area and some ended up in the garage.

Tammy Duckworth, D-Illinois, said that by 10:30 p.m., Capitol Police had apologized to the Guard personnel, who had been allowed back into the complex Thursday night.

WATCH: National Guard troops leave the Thurgood Marshall Judicial Center garage after U.S.

Capitol Police temporarily relocated their rest area.

Troops have since returned to the Capitol.

The Washington, D.C., National Guard said earlier Thursday that they were asked to move its rest area by Capitol Police.

"As Congress is in session and increased foot traffic and business is being conducted, Capitol Police asked the troops to move their rest area.