2020 Democrats ramp up calls for Trump impeachment

Democratic presidential hopefuls have ramped up their calls for the House to begin impeachment proceedings against President TrumpDonald John TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' MORE after special counsel Robert MuellerRobert (Bob) Swan MuellerThis week: Mueller dominates chaotic week on Capitol Hill Top Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction MORE spoke publicly for the first time about his investigation.

Sens. Cory BookerCory Anthony BookerTrump tweets, rally chant dominate Sunday shows as president continues attacks Sunday shows - Fallout over Trump tweets Booker: Trump is 'worse than a racist' MORE (N.J.) and Kirsten GillibrandKirsten Elizabeth GillibrandHarris faces pressure to define policy proposals Democratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage MORE (N.Y.) joined fellow Democratic Sens. Kamala HarrisKamala Devi HarrisThe Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony Biden's lead narrows in early voting states: poll New CBS poll shows Biden with 7-point lead in New Hampshire MORE (Calif.) and Elizabeth WarrenElizabeth Ann WarrenWarren warns another 'economic crash' is coming The Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony Biden's lead narrows in early voting states: poll MORE (Mass.) in calling for impeachment proceedings, with both Warren and Harris saying that Mueller had delivered an "impeachment referral."

Gillibrand said that "it's time for Republicans and Democrats to begin impeachment hearings and follow the facts wherever they may lead. We cannot let this president defy basic accountability measures built into our Constitution."

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In a statement, she pointed to the Trump administration's refusal to comply with congressional subpoenas and "the fact that Robert Mueller clearly expects Congress to exercise its constitutional authority and take steps that he could not."

Mueller said during a press conference Wednesday morning that his team did not come to a conclusion as to whether Trump committed a crime by interfering with the probe, but reiterated that his report did not exonerate Trump.

“After that investigation, if we had confidence that the president clearly did not commit a crime, we would have said that,” the special counsel said.

Mueller also emphasized that he did not have the authority to consider whether the president committed a crime due to Justice Department regulations. The special counsel has previously said that Congress has the authority to pursue obstruction of justice investigations.

The Justice Department released Mueller's report in redacted form last month. It detailed several instances of Russian interference in the 2016 presidential election and also laid out 10 instances of potential obstruction. Trump has insisted that he did not obstruct justice or coordinate with Russia.

Before Wednesday's statement, a number of 2020 presidential candidates had already called for impeachment proceedings, with Warren last month becoming the first White House contender to call for impeachment.

Harris on Wednesday maintained that the process was a "constitutional obligation," while Booker tweeted that Congress "has a legal and moral obligation to begin impeachment proceedings immediately." 

Booker said in a statement that since the Mueller report was released, Trump has "stonewalled Congressional oversight efforts," pointing to battles between the administration and House Democrats for documents and testimony from Attorney General William BarrWilliam Pelham BarrUkrainian officials and Giuliani are sharing back-channel campaign information: report Will Democrats be up to the task of publicly interviewing Mueller? A question for Robert Mueller MORE and former White House Counsel Don McGahn.

"It is our legal and moral obligation to hold those who have committed crimes accountable. It’s clear that the House must begin impeachment proceedings," Booker said.

Warren similarly called for congressional action, saying, "Mueller’s statement makes clear what those who have read his report know: It is an impeachment referral, and it’s up to Congress to act. They should."

Former Rep. Beto O'RourkeBeto O'RourkeBiden's lead narrows in early voting states: poll New CBS poll shows Biden with 7-point lead in New Hampshire Ted Cruz: Trump's chances of winning reelection are '50-50' MORE (Texas) called impeachment proceedings the only way to ensure "consequences, accountability, and justice."

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegNashville radio host blocked by employer from airing his interview with Buttigieg Buttigieg says white supremacy could be 'issue that ends this country' Biden's lead narrows in early voting states: poll MORE also said Mueller's speech was "as close to an impeachment referral as it gets."

Meanwhile, former Housing and Urban Development Secretary Julián Castro specifically called for an impeachment inquiry.

Rep. Seth MoultonSeth Wilbur MoultonStanley McChrystal endorses Moulton for president 2020 Democrats react to 'send her back' chants at Trump rally 2020 Democratic candidates rip Trump remarks at campaign rally MORE (Mass.), who is also among the two dozen Democrats vying for their party's presidential nomination, tweeted 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. 

–– Updated: 2:59 p.m.