Rep. Eric Burlison (R-Mo.) said that he and other unnamed lawmakers have slept in their offices at the Capitol because Washington, D.C., is "very dangerous" at night. He did not elaborate.

"I don't want to walk back and forth from an apartment in D.C. at night or in the morning—early morning—to get to work," Mr. Burlison told Todd Starnes on his radio program. "It's not a safe environment."

He made reference to Rep. Henry Cuellar (D-Texas) having recently been carjacked in the district just blocks from the U.S. Capitol. The Democratic lawmaker was unharmed but his car was stolen by three armed assailants, police said.

"It's insane to even own a car in D.C. because wherever you park, it is going to cost you a fortune and it's likely to get broken into and you're likely to get carjacked," Mr. Burlison said.

As for Mr. Cuellar, he was back at work in the Capitol on Tuesday morning. Recalling the incident on Sunday night, he said that the assailants appeared from "out of nowhere" and "pointed guns at me."

"I looked at one with a gun, another with a gun, and I felt one behind me," Mr. Cuellar said. "They said they wanted my car, and I said, 'Sure.' You got to keep calm under those situations, and they took off."

The congressman was approached by three young black males in black clothing and black masks, according to a statement Mr. Cuellar gave to Capitol officials.

"According to the victim's statements, the suspects 'swarmed [the victim's] vehicle, pointed firearms in his face and demanded the keys to the car.' Thankfully there were not any injuries," the U.S. Capitol Police said in a statement. "A witness told investigators three males in knit caps and ski masks were involved. The witness reported that the suspects were 5'10" black males who may have been around the age of 16 due to their build."