Every Saturday morning, we’re publishing “This Week in the 2020 Race”: a quick way to catch up on the presidential campaign and the field of 24 candidates for the Democratic nomination.

One way to respond to Mueller? Print T-shirts

In testimony before two House committees on Wednesday, Robert S. Mueller III, the former special counsel, reiterated his findings on Russian interference in the 2016 election and President Trump’s efforts to stop his investigation. Despite sharp questions, he confirmed nothing beyond what was in his report, but he did say unequivocally that Mr. Trump was wrong to claim exoneration.

The Democratic presidential candidates , more than half of whom support either impeachment or an impeachment inquiry, largely described the hearing as confirmation of “what we already knew,” as Senator Amy Klobuchar of Minnesota put it in an email to supporters. If anything, Mr. Mueller’s dry testimony made impeachment before the next election even less likely.

But Senator Elizabeth Warren of Massachusetts reiterated her belief that the report amounted to an impeachment referral.