Senate Democratic Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (N.Y.) on Tuesday said he supports Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE’s (D-Calif.) decision to hold back on a formal impeachment inquiry against President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, despite growing support from members of his leadership team.

“I believe that Speaker Pelosi is handling this appropriately,” Schumer said when asked if he would change his position and support the launch of impeachment proceedings after one of his top deputies, Sen. Patty Murray Patricia (Patty) Lynn MurraySenate Democrats introduce legislation to probe politicization of pandemic response Trump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency MORE (D-Wash.), called for an inquiry.

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Schumer has been careful not to undercut Pelosi’s resistance to launching impeachment proceedings, despite pressure from within his own caucus.

After Murray, the third-ranking member of Senate Democratic leadership, said she would back launching an inquiry, Sen. Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (D-Mich.), the Senate Democratic Policy Committee chairwoman, also offered support for the move.

Democratic Caucus Vice Chairwoman Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.), Steering Committee Chairwoman Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), Outreach Chairman Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) — who are all presidential candidates — and Chief Deputy Whip Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.) also back an inquiry.

Despite the backing of those key members, Senate Democrats overall are divided over how to handle the impeachment question, with a majority of the conference arguing it should be left entirely to Pelosi and the House.

But proponents of taking a more aggressive position say the momentum is shifting in favor of starting impeachment proceedings.

Merkley said Murray’s announcement was a major development in the Democratic battle over impeachment.

“I think it’s very helpful. It adds to the momentum,” he said

Advocates for impeachment think it will be easier to persuade Pelosi to move forward if Schumer and other Senate Democrats call for a formal impeachment process.

“We’ve been running advertising nationwide and of course we’ve got supporters in all 50 states and so when we do our grass-roots organizing, we always include the senators in that. So they’ve received tens of thousands of phone calls and emails and other outreach,” said Kevin Mack, the lead strategist of Need to Impeach, a group founded by Democratic mega-donor Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE, who is also running for president.

“We feel strongly that Leader Schumer should be for impeachment and should make his feelings known and we think the more Democrats that come out for this, the more pressure there is on the House leadership to do their constitutional duty,” Mack added.

Need to Impeach on Tuesday announced the launch of a “six-figure” ad campaign featuring key moments of former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s testimony before two House committees last week on his investigation into Trump and his inner circle.

Sen. Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii), a member of the Senate Judiciary Committee, says a formal impeachment inquiry would boost House investigations of Trump. She said it could help get judges to force the administration to comply with Democratic subpoenas.

“They should just do an impeachment inquiry so that they’re able to issue the subpoenas and have the subpoenas have, possibly if you have to go to court, more weight,” she said.

Hirono said if a formal impeachment process is started then federal judges who rule on subpoenas are less likely to view Congress as “just fishing” but instead “very purposeful in their investigatory efforts.”

But Senate Democrats are divided over whether launching the impeachment process would be smart ahead of the 2020 elections.

Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.), who is up for reelection next year in a traditional swing state, said impeachment is a divisive topic and argued that voters care more about bread-and-butter economic issues, such as how to afford health care coverage and pay for college. Her remarks are similar to those Pelosi has made publicly in suggesting an impeachment drive could backfire on Democrats.

“The most important thing to do is to defeat Donald Trump at the ballot box. I think the country is still very divided and that would increase the divisions in the country,” she said of impeachment.

“I hear from people on both sides,” she said of feedback from constituents when she goes back home.

She said voters are more concerned about “how to they’re going to get health care for their kids, how they’re going to pay their college loans” while “companies are worried where they’re going to get their workers.”

Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.), who represents a state that Trump won by 20 points in 2016, said he’s worried that an impeachment debate would overshadow other issues.

“My concern is that it takes our focus off the issues that Montanans are talking about, which is health care and college and infrastructure and that kind of stuff,” he said.

Murray’s call for the beginning of impeachment proceedings caught colleagues by surprise and prompted speculation within the Senate Democratic Conference over whether she was trying to establish an independent brand within the leadership or merely responding to political dynamics at home.

“She’s a very planful person. She doesn’t do things from the gut,” said a Democratic senator who requested anonymity to comment on Murray’s motives.

Murray is the assistant Democratic leader, the third-ranking member of the Senate Democratic leadership, and was on a swift trajectory upward under former Senate Majority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.), who often praised Murray in the highest terms when he was in charge of the conference.

Reid picked her in 2011 to serve as the Democratic co-chair of the so-called supercommittee, or the Joint Select Committee on Deficit Reduction, which was formed after a standoff over raising the debt limit earlier that year.

He also tapped Murray to head the Democratic Senatorial Campaign Committee in the 2011-2012 election cycle, when Democrats picked up two seats.

Murray’s call for impeachment proceedings to begin may solidify her liberal credentials for a future leadership race or may help stave off a potential primary challenge when she is up for reelection in 2022.

All seven Democrats of the House delegation from Washington state have also called for an impeachment inquiry against Trump. Washington’s junior senator, Sen. Maria Cantwell Maria Elaine CantwellHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE, was the only congressional Democrat from the state not to join the effort.