Elizabeth Warren has become the first 2020 election candidate to make a clear call for impeachment proceedings against Donald Trump following the release of special counsel Robert Mueller’s redacted report.

The Massachusetts senator tweeted that it would be damaging to “ignore a president’s repeated efforts to obstruct an investigation into his own disloyal behaviour” and would allow future presidents to act in the same way.

She added: “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.”

Mr Mueller, who examined whether Mr Trump’s campaign coordinated with Russia during the 2016 election and whether the president tried to interfere with the inquiry, made no clear verdict on obstruction of justice.

His report did, however, lay out 11 possible attempts to influence the investigation – although he indicated the president was “mostly unsuccessful” because his aides refused to carry out orders.

Mueller investigation: The key figures Show all 12 1 /12 Mueller investigation: The key figures Mueller investigation: The key figures Robert Mueller is the special counsel overseeing the investigation into Russia's meddling in the 2016 election, and potential obstruction of justice by the president. Mr Mueller has a pristine reputation in Washington, where he was previously in charge of the FBI. Throughout his investigation, he and his team have been notoriously tight lipped about what they know and where their investigation has led. REUTERS Mueller investigation: The key figures Former FBI director James Comey was the catalyst that led to the appointment of special counsel Robert Mueller. Mr Comey was fired by the president after Mr Trump reportedly asked him to drop his own Russia investigation. Mr Trump has long maintained that the investigation is a "witch hunt". AFP/Getty Images Mueller investigation: The key figures Deputy attorney general Rod Rosenstein had authority over the special counsel investigation for much of the two years it has been active. Mr Rosenstein found himself with that responsibility after then-attorney general Jeff Sessions recused himself from that oversight. AP Mueller investigation: The key figures Attorney general Jeff Sessions's decision to recuse himself from oversight of the special counsel investigation may have cost him his job in the end. Mr Sessions resigned last year, after weathering a contentious relationship with Donald Trump who vocally criticised his attorney general for taking a step back. Mr Sessions recused himself from the oversight citing longstanding Justice Department rules to not be involved in investigations overseeing campaigns that officials were apart of. AP Mueller investigation: The key figures Attorney General William Barr is currently responsible for oversight of the special counsel investigation. Mr Barr's office will be the first to receive the Mueller report when it is finished. His office will then determine what portion or version of that report should be delivered to Congress, and also made public. EPA Mueller investigation: The key figures Michal Cohn is the president's former personal lawyer, who has been helping the special counsel investigation as a part of a plea deal over financial crimes, and campaign finance crimes, he has pleaded guilty to. Among those crimes, Cohen admitted to facilitating $130,000 in hush money payments to adult film actress Stormy Daniels during the 2016 campaign. Cohen has said he did so at the direction of Mr Trump. Cohen has also admitted that he maintained contacts with Russian officials about a potential Trump real estate project in Moscow for months longer than Mr Trump and others admitted. The talks continued well into 2016 during the campaign, he has said. AP Mueller investigation: The key figures Stormy Daniels has alleged that she had an affair with Donald Trump in 2006, soon after Melania Trump gave birth to Baron Trump. The accusation is of particular importance as a result of the $130,000 hush money payment she received to keep quiet about the affair during the 2016 campaign. AP Mueller investigation: The key figures Paul Manafort was Donald Trump's former campaign chairman. Manafort was charged alongside Rick Gates for a slew of financial crimes, and was convicted on several counts in a Virginia court. He then pleaded guilty to separate charges filed in a Washington court. Manafort has been sentenced to just 7.5 years in prison for his crimes — in spite of recommendations from the special counsel's office for a much harsher sentence. AP Mueller investigation: The key figures George Papadopoulos was one of the first individuals associated with the Trump campaign to be charged by the Mueller probe. He ultimately received a 14 day prison sentence for lying to investigators about contacts he had with Russian officials. AP Mueller investigation: The key figures Roger Stone is a well known political fixer and operative, who has made a name for himself for some dirty tactics. He has been charged by the Mueller probe earlier this year, and he has been said to have had prior knowledge that WikiLeaks planned on publishing stolen emails from the Hillary Clinton campaign in 2016. Getty Images Mueller investigation: The key figures Rick Gates was charged alongside former Trump campaign chairman Paul Manafort for a range of crimes. Gates, who worked alongside Manafort for a pro-Russia Ukrainian political party. The two were charged with conspiracy and financial crimes. Gates pleaded guilty. AP Mueller investigation: The key figures Former national security adviser Michael Flynn was one of the first casualties of the Russia scandal, and was forced out of his position in the White House weeks after Donald Trump took office. Flynn pleaded guilty in 2017 to "willfully" making fraudulent statements about contacts he had with Russian officials including former Russian ambassador to the US Sergey Kislyak. Flynn then lied to Vice President Mike Pence about that contact. REUTERS

Other Democrats running in 2020 have been more cautious on impeachment than Ms Warren in their response to the publication. Julian Castro said it would be “perfectly reasonable for congress to open up those proceedings”.

Both Jay Inslee of Washington and Eric Swalwell – both of whom have recently launched presidential campaigns – said only that the idea should not be taken off the table.

Other Democratic candidates, including senators Cory Booker and Kamala Harris, suggested it was too soon to start impeachment proceedings.

“We don’t have an unredacted version of the report. We don’t have the underlying materials that that report was written upon. We haven’t had yet an opportunity to have hearings where we interview Mueller,” said Mr Booker said during a campaign stop in Reno, Nevada.

“I think that’s there definitely a conversation to be had on that subject, but first I want to hear from Bob Mueller and really understand what exactly is the evidence that supports the summary that we’ve been given,” said Ms Harris on impeachment hearings.

Pete Buttigieg, the Indiana mayor also running for the White House, suggested it was not the best way to get rid of Mr Trump.

He told NBC’s Late Night with Seth Meyers: “If we really want to send Trumpism into the history books, the best thing we can do is defeat it decisively at the ballot box in 2020.”

Alexandria Ocasio-Cortez, while not running in 2020, has signed on to an impeachment resolution from fellow Democrat, Rashida Tlaib.

The chairman of the House Judiciary Committee, Jerrold Nadler, has issued a subpoena for the full Mueller report and expects the Justice Department to comply by 1 May. Attorney general William Barr is to appear before the committee on 2 May, while Mr Nadler has also summoned Mr Mueller to testify by 23 May.

The only Republican who had declared he will run against Donald Trump in 2020 said on Friday he was “horrified” by special counsel Robert Mueller’s report, but said he could not back impeachment for “political reasons”.