Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) made impeaching President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE a key campaign issue when she became the first Democratic presidential candidate to call for it publicly.

Previously, the crowd of hopeful presidential nominees steered clear of the issue — and some still do, with multiple candidates deferring to Congress.

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But Warren wading in after the release of the report on 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 investigation into Russia's election interference reignited the debate over whether Democrats should pursue proceedings to impeach Trump.

Mueller's public comments on the report May 29 further pushed some Democratic candidates toward impeachment proceedings.

Here’s where they currently stand.

Support impeachment

Warren

Warren was the first 2020 candidate to clearly call for proceedings on April 19, following the public release of Mueller’s report.

“The severity of this misconduct demands that elected officials in both parties set aside political considerations and do their constitutional duty,” she tweeted on Friday. “That means the House should initiate impeachment proceedings against the President of the United States.”

The severity of this misconduct demands that elected officials in both parties set aside political considerations and do their constitutional duty. That means the House should initiate impeachment proceedings against the President of the United States. — Elizabeth Warren (@ewarren) April 19, 2019

Harris

Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) initially said that more information is needed before making a decision, but advocated for impeachment in a town hall on April 22.

"We have very good reason to believe that there is an investigation that has been conducted which has produced evidence that tells us that this president and his administration engaged in obstruction of justice. I believe Congress should take the steps toward impeachment," Harris said at a CNN town hall in New Hampshire.

Booker

Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) announced his support for impeachment proceedings on May 29 following a press conference from Mueller, the special counsel’s first public comments since being appointed.

“Robert Mueller’s statement makes it clear: Congress has a legal and moral obligation to begin impeachment proceedings immediately,” Booker tweeted.

“I’ve been asking for Mueller’s testimony—today he made his views clear. This Administration has continued to stonewall Congress’s oversight. Beginning impeachment proceedings is the only path forward.”

Gillibrand

Following Mueller’s press conference on May 29, Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) switched her position to backing impeachment proceedings.

“It's time for Congress to begin impeachment hearings and follow the facts. Robert Mueller clearly expects Congress to exercise its constitutional authority and take steps that he could not,” she tweeted. “We can't let the president defy basic accountability measures built into our Constitution.”

She had previously called for a decision to be delayed until the public heard from Mueller.

O’Rourke

Democratic hopeful Beto O’Rourke on May 4 changed his initial position on impeachment, deferral to Congress, to supporting it.

“We're finally learning the truth about this president. And yes, there has to be consequences. Yes, there has to be accountability. Yes, I think there's enough evidence now for the House of Representatives to move forward with impeachment,” he said in an interview with The Dallas Morning News.

“This is our country, and this is the one chance that we get to ensure that it remains a democracy and that no man, regardless of his position, is above the law.”

Castro

Former Housing and Urban Development Secretary Julián Castro was the first 2020 candidate to back proceedings.

Castro told CNN's Anderson Cooper on April 19 that it would “perfectly reasonable” for Congress to open impeachment proceedings.

“It’s clear that Bob Mueller in his report left that in the hands of Congress,” he added.

On the issue of obstruction of justice, Mueller’s team investigated 10 potential instances, including Trump's firing of FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and efforts to deny that he ordered then-White House counsel Don McGahn to demand the special counsel be removed.

After laying out the cases, the special counsel did not reach a conclusion in his report, but did mention that Congress has the authority to conduct obstruction of justice investigations.

Hickenlooper

Former Colorado Gov. John Hickenlooper John HickenlooperCook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE on May 30 said he had been swayed by Mueller’s press conference and now supports impeachment proceedings.

“After listening to Mueller, and I wanted to hear what he had to say, I think of myself as an extreme moderate, but I think he laid the responsibility clearly at the doorstep of Congress. I think we have to begin an impeachment inquiry. That doesn’t mean we’re going to impeach President Trump tomorrow or maybe ever. But I do think we have an obligation to follow where the facts lead,” Hickenlooper said on CNN.

Moulton

Rep. Seth Moulton Seth MoultonThe Hill's Morning Report - Presented by Facebook - Markey defeats Kennedy; Trump lauds America's enforcers in Wisconsin Moulton fends off primary challenges in Massachusetts Portland: The Pentagon should step up or pipe down MORE (D-Mass.) tweeted on May 29 after Mueller’s press conference that impeachment hearings should begin "tomorrow."

"The Mueller investigation has provided the evidence. It’s up to Congress to examine that evidence and pursue justice to its conclusion, whatever that may be, regardless of the political consequences," Moulton said in an email to supporters.

Messam

Miramar, Fla., Mayor Wayne Messam Wayne Martin MessamKey moments in the 2020 Democratic presidential race so far Wayne Messam suspends Democratic presidential campaign 2020 primary debate guide: Everything you need to know ahead of the November forum MORE (D) told The Hill he supports impeachment proceedings based on the evidence available.

"Based on what is available I believe the President should be placed under impeachment proceedings and let the weight of the full report carry out the justice the American people deserve," Messam said in an April 22 statement.

"The redacted Mueller Report provides alarming and damning evidence of the Trump Campaign's interactions with Russians. Special counsel Mueller provided evidence that would determine if impeachment proceedings should take place. The full special counsel report without redaction should be released to congress for review to determine If evidence is sufficient to impeach Trump. Congress has the constitutional authority of oversight and must be given the full report," he said.

Sanders

“I believe the Judiciary Committee should begin impeachment inquiries,” Sanders said at a campaign rally in Henderson, Nevada. “That is inquiries, not impeachment, to determine whether or not Trump has committed impeachable offenses.”

Sanders had previously said that Congress should continue investigating Trump, but had not explicitly called for an impeachment inquiry.

Klobuchar

Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) first publicly backed impeachment proceedings on June 14, citing Trump’s interview with ABC News earlier that week in which he suggested that if a foreign government offered information he would “take it.”

Trump also would not commit to calling the FBI if a foreign power offered damaging information on a political opponent.

“I would support impeachment proceedings beginning now, but I also understand that they may want to be doing investigations leading up to it and I think they should be given the time to do that,” Klobuchar said on CNN’s “New Day.”

She had previously declined to take a position on the issue, saying senators are meant to be the jury on impeachment.

De Blasio

New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE called for impeachment proceedings on June 14, becoming the third candidate to do so following Trump’s interview in which he wouldn't commit to calling the FBI if a foreign power offered damaging information on a political opponent.

"It was an invitation to make a deal. You get me dirt on my opponents and we’ll take care of you, and we’ve seen no better example than with Russia and Putin where whatever Putin does he gets an affirmation from Donald Trump, and now more and more it looks like in exchange for electoral favors," de Blasio told MSNBC's "Morning Joe."

De Blasio had said before that Democrats should focus on defeating Trump in the 2020 election, rather than on beginning impeachment proceedings.

Not backing impeachment

Buttigieg

South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE said in late May that "of course" he supports impeachment proceedings, but stopped short of saying whether the House should begin the process.

On May 29, he inched closer to supporting impeachment when he tweeted that Mueller's comments on his investigation were "as close to an impeachment referral as it gets," adding that Congress "alone can act."

This is as close to an impeachment referral as it gets. Robert Mueller could not clear the president, nor could he charge him — so he has handed the matter to Congress, which alone can act to deliver due process and accountability. — Pete Buttigieg (@PeteButtigieg) May 29, 2019

Klobuchar

Sen. Amy Klobuchar (D-Minn.) declined to take a position on impeachment, saying senators are meant to be the jury on impeachment.

“Our job is to be jury, so I’ve been really careful talking about if an impeachment is brought before us,” she told MSNBC's Chris Hayes on April 19.

De Blasio

New York City Mayor Bill de Blasio (D) on May 29 declined to endorse impeachment, but did say Congress should continue investigations.

“Congress must continue to investigate #ConDon & his cronies,” he tweeted. “I'm focused on beating @RealDonaldTrump in 2020. As a New Yorker, I know all of his tricks and am tough enough to take him on.”

Congress must continue to investigate #ConDon & his cronies. I'm focused on beating @realDonaldTrump in 2020. As a New Yorker, I know all of his tricks and am tough enough to take him on. — Bill de Blasio (@BilldeBlasio) May 29, 2019

Inslee

Washington Gov. Jay Inslee Jay Robert InsleeBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Bottom line Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE said “impeachment should not be off the table,” deferring to Congress on April 19.

It is clear that the president tried and tried and tried to stop the Mueller investigation. Congress needs to get to the bottom of what's going on here. Impeachment should not be off the table.https://t.co/ScPHa6eW6N — Jay Inslee (@JayInslee) April 19, 2019

Williamson

Self-help author Marianne Williamson Marianne WilliamsonMarianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 Marianne Williamson: Democratic convention 'like binge watching a Marriott commercial' MORE said on April 14 that said Trump’s “fascist leanings” justify impeachment, but left the decision over proceedings to Speaker Nancy Pelosi (D-Calif.).

“As long as the Republicans… are in charge of the Senate, they wouldn’t remove him anyway, so I leave that to Nancy Pelosi,” she said in a CNN town hall. “I think she’s got it together on this issue and I’m sure she understands the quandary very, very well.”

Bennet

Colorado Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D) said on May 14 that he was not ready to call for impeachment.

“I’m not ready to say the president should be impeached,” Bennet said on CBS’s “Face the Nation.”

“I think it looks from the report as though he’s committed impeachable offenses. I think there is every reason why the investigation in the Congress should continue and then we should make an assessment of where it leads.”

Gabbard

Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) said Democrats need to move on from the Mueller report on April 21.

"I don't think that we should defeat Donald Trump through impeachment,” she told Fox News. “I think it's really important for us, in this country, to come together and have the American people vote to take Donald Trump out of office in 2020."

Yang

Entrepreneur Andrew Yang Andrew YangDoctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls Buttigieg launches his own podcast MORE suggested in an April 18 tweet that the decision over impeachment should be left to 2020 voters.

"I am glad that the Mueller Report has been made public. It's important to the American people. My focus is on beating Donald Trump at the ballot box and solving the problems that got him elected in the first place," Yang said.

I am glad that the Mueller Report has been made public. It’s important to the American people. My focus is on beating Donald Trump at the ballot box and solving the problems that got him elected in the first place. — Andrew Yang (@AndrewYang) April 18, 2019

Gravel

Former Sen. Mike Gravel (Alaska), who is running with the intention of introducing issues on the debate stage, explicitly said on April 18 that he was not interested in responding to Mueller’s report.

“we won't be doing tweets about the mueller report because it's pointless,” his account tweeted.

we won't be doing tweets about the mueller report because it's pointless — Mike Gravel (@MikeGravel) April 18, 2019

Delaney

Former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) released a statement April 18 suggesting that responding through the ballot box is the appropriate response to the Mueller report.

“The one conclusion that every American should reach from the Mueller report is that we are better than this,” he tweeted. “We deserve a President free on conflicts, conducting themselves with honor and integrity, and possessing a moral compass that guides their actions. We have to win in 2020.”

The one conclusion that every American should reach from the Mueller report is that we are better than this. We deserve a President free on conflicts, conducting themselves with honor and integrity, and possessing a moral compass that guides their actions. We have to win in 2020. — John Delaney (@JohnDelaney) April 18, 2019

Bullock

Montana Gov. Steve Bullock Steve BullockMcConnell locks down key GOP votes in Supreme Court fight Senate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race MORE released a statement on May 29 following Mueller’s press conference backing oversight, but not impeachment.

"Congress should fulfill its constitutionally empowered oversight of this Administration, and the President and his staff have an obligation to be responsive to those investigations," Bullock said. "As a former Attorney General, I know that no individual is above the law."

– Updated June 14 at 11:06 a.m.