“I was not on the investigate-and-prosecute train before yesterday,” Kathleen Sullivan, a former chairwoman of the New Hampshire Democratic Party, said on Thursday. “However, undermining the very foundations of democracy and the Constitution is a crime that can’t be ignored.”…

But interviews with more than 50 current and former Democratic elected officials, Democratic National Committee members and party activists found an overwhelming consensus across the party’s ideological spectrum toward holding Mr. Trump personally accountable and launching congressional and Justice Department investigations into him, his family and his top aides — not only for inciting last week’s violent mob at the Capitol but for a host of other actions during his presidency.

The transgressions they cite include collusion with Russia, tax fraud, illegal pressure on state elections officials, using federal offices for political activity and violation of the constitutional provision that prohibits a president from profiting from foreign governments…

“Absolutely Trump should do jail time,” said Representative Jamaal Bowman of New York. A Justice Department investigation, Mr. Bowman said, “needs to happen on Jan. 20, as soon as possible.”