Andrew Yang, a businessman from New York with a sizable online following, said on Twitter last month that his focus is on beating Mr. Trump at the ballot box “and solving the problems that got him elected in the first place.”

Marianne Williamson, a self-help author who is calling for a “moral and spiritual awakening in the country,” has said that Mr. Trump is “goading us to impeach him.”

Most are taking a wait-and-see approach

Senator Cory Booker of New Jersey has said it is premature to discuss impeachment, since lawmakers still do not have an unredacted version of the Mueller report and Mr. Mueller has not testified on Capitol Hill since its release.

“There’s a lot more investigation that should go on before Congress comes to any conclusions like that,” he said during a campaign event in Nevada last month.

John Hickenlooper, the former governor of Colorado, also said last month that the decision to move forward with impeachment proceedings shouldn’t be made until Democrats receive an unredacted version of the report.

Senator Kirsten Gillibrand of New York told Politico this month that impeachment “should be left on the table,” but she also said that Speaker Nancy Pelosi’s efforts to slow the rush to impeach are smart.

Joseph R. Biden Jr., the former vice president, said in an interview with “Good Morning America” on April 30 that for now, Congress should continue its own investigations. But if the administration tries to block those inquiries, Congress would have “no alternative” but to “go to the only other constitutional resort they have, which is impeachment,” Mr. Biden said.