Derek Kilmer, Suzan DelBene, Denny Heck and Kim Schrier, all of Washington state - calling for an inquiry after Nadler's remarks. The group's announcement comes after over 10 Democrats voiced support for impeachment.
Overall, 27 percent of respondents who read, saw, or heard Mueller's testimony said they are now more likely to support impeachment, while 26 percent said they are less likely. A new POLITICO/Morning Consult poll, conducted right after his testimony, found just 37% back Congress beginning impeachment proceedings against Trump.
Nadler also said he would sue former White House counsel Don McGahn as early as this week to compel his testimony.
Several other Judiciary Committee members were even more forceful at the event.
But almost half of voters, 49 percent, think Trump tried to impede or obstruct the Russian Federation investigation - more than the 35 percent who say they don't think so. When asked if the filings would be stronger if they were part of an official impeachment inquiry, Nadler said he didn't think so.
Cleaver, a Democrat from Kansas City, said Congress has a constitutional responsibility to further investigate evidence presented by Mueller's investigation into Russian interference in the 2016 election.
"I think we have to do it carefully because we don't want to split the entire nation apart literally nearly, you know, to the point that people aren't speaking to each other, which is where we are now", Van Drew said.
FILE - Speaker of the House Nancy Pelosi, D-Calif., speaks during a news conference after hearings with former special counsel Robert Mueller, on Capitol Hill in Washington, July 24, 2019.
"No, I'm not trying to run out the clock", Pelosi told reporters last week."We will proceed when we have what we need to proceed - not one day sooner". On Friday she said everyone has the liberty to espouse their own opinion.
Moreover, some political observers believe Mueller's testimony likely took the wind of the of sails regarding impeachment.
"But the jury that I'm most anxious about, not the Senate because I think that's a preordained conclusion, is the American people. Nancy Pelosi, who is a wintry eyed realist, is having none of it: she thinks impeachment is a fools' errand and I have to say I agree with her", said William Galston, a senior fellow at the Brookings Institution.
Trump took aim at Nadler on Saturday night, fuming on Twitter that "we gave Nadler and his Trump hating Dems the complete Mueller Report (we didn't have to), and even Mueller himself, but now that both were a total BUST, they say it wasn't good enough". "And a president who is immune from prosecution by virtue of the Justice Department's saying that every president's immune from prosecution should be prosecuted after he leaves office - or at least impeach him and remove him from office, if you can prove those crimes".