“Those members of Congress who had groups coming through the Capitol that I saw on Jan. 5, a reconnaissance for the next day, those members of Congress that incited this violent crowd,” Ms. Sherrill said, “those members who attempted to help our president undermine our democracy, I’m going to see that they’re held accountable.”
Ms. Sherrill did not respond to follow-up questions.
Representative Tim Ryan, Democrat of Ohio, said lawmakers were aware of the tours but are now looking at them in a new light given the attack. He said they included “handfuls” of people and that the authorities were aware of them. “Now you look back on certain things and you look at them differently so, yeah, we’re looking into it,” he said.
Mr. Crow said he was aware of tours but uncertain about their nature.
Pressure is mounting on the Republican members of Congress who associated themselves with far-right extremist groups in the days leading up to the mob attack. Several of Mr. Trump’s most ardent supporters, including Representatives Mo Brooks of Alabama and Paul Gosar and Andy Biggs, both of Arizona, have been accused of helping plan the Jan. 6 rally that led to the violent attack on the Capitol.
A photo also circulated misleadingly online on Wednesday that purported to implicate Representative Lauren Boebert of Colorado in giving such a tour, but it was from 2019 in Colorado.
Mr. Crow said he found the photograph concerning nonetheless because others in it flashed “white power gang symbols.”
“I’m very concerned about the potential complicity of members,” Mr. Crow said. “Certainly there are plenty of examples of incitement that members of Congress are responsible for. I think we have to do an investigation to determine what precisely happened.”
Representative Steny H. Hoyer, the majority leader from Maryland, played down the prospect of any immediate discipline for lawmakers until after the impeachment proceeding against President Trump is finished.
“There will be time to deal with that,” Mr. Hoyer said of far-right Republicans in Congress. “Right now we’re dealing with the president.”