Some lawmakers recount feeling unsafe because of colleagues’ behavior during Capitol siege.

Ms. Pressley echoed Ms. Ocasio-Cortez, writing on Twitter that she did not feel safe sheltering with certain lawmakers.

“The second I realized our ‘safe room’ from the violent white supremacist mob included treasonous, white supremacist, anti masker Members of Congress who incited the mob in the first place, I exited,” Ms. Pressley said.

Ms. Ocasio-Cortez and Ms. Pressley are both members of “The Squad,” a group of four progressive congresswomen of color. They have been verbally attacked by conservatives and the president for their policies.

Representative Lauren Boebert, Republican of Colorado, drew criticism from Democrats for tweeting about Speaker Nancy Pelosi’s location during the attack, despite reports that lawmakers were instructed by security officials not to reveal their whereabouts. Ms. Boebert later dismissed the seriousness of her actions.

“They accuse me of live-tweeting the speaker’s presence after she had been safely removed from the Capitol, as if I was revealing some big secret, when in fact this removal was also being broadcast on TV,” Ms. Boebert said in a statement on Monday.

In the week leading up to the Capitol siege, Ms. Boebert, a fiery gun-rights activist, released an ad declaring that she would carry her Glock with her on the streets of Washington, including on her way to work. On her way to the House chamber for the impeachment vote on Wednesday, Ms. Boebert caused a spectacle by pushing her way through metal detectors, which were installed as part of heightened security measures after the attack, and ignoring police officers who asked her to stop.

Ms. Boebert and other freshman Republicans, such as Marjorie Taylor Greene of Georgia and Madison Cawthorn of North Carolina, have questioned or outright flouted guidelines meant to protect lawmakers from violence, intruders or the coronavirus.

“I did not know if I was going to make it to the end of that day alive,” Ms. Ocasio-Cortez said during her livestream. “Not just in a general sense, but also in a very, very specific sense.”

Luke Broadwater contributed reporting.