"The immediate threat is intelligence related to a possible plot by a militia group to attack the Capitol on Thursday. Followers of the QAnon conspiracy theory believe former President Trump will be reinaugurated on March 4, a traditional date for presidential inaugurations until 1933...."
How much evidence of a possible attack was there? Is vacating the building the right response to whatever this was? I presume it was something more than just people spinning theories that focused on a date that happens to have historical significance, but only the House is abandoning its workplace, not the Senate.