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The statement claims there is “overwhelming” evidence of corrupt intent to block the investigation by Special Counsel Robert Mueller into Russian interference in the 2016 election.
“Each of us believes that the conduct of President Trump described in Special Counsel Robert Mueller’s report would, in the case of any other person not covered by the Office of Legal Counsel policy against indicting a sitting President, result in multiple felony charges for obstruction of justice,” the statement reads.
US senator Richard Blumenthal said he was “proud” to add his name to the list of signatures, which includes officials who worked for both Democratic and Republican administrations stretching back to Dwight Eisenhower.
He was joined by Bill Weld, a former US attorney who is standing against Mr Trump for the Republican presidential nomination, and Donald Ayer, a former deputy attorney general under George HW Bush.
1/13 Joe Biden
The former vice president - poised to be a frontrunner - has announced his run. He recently faced scrutiny for inappropriate touching of women, but was thought to deal with the criticism well
EPA
2/13 Bernie Sanders
The 2016 runner-up has announced that he will be running again in 2020
Getty
3/13 Pete Buttigieg
The Indiana mayor and war veteran will be running for president. If elected, he would be the first openly LGBT+ president in American history
Getty
4/13 Beto O'Rourke
The former Texas congressman formally launched his bid for the presidency in March. He intends to run on a progressive platform, stating that the US is driven by "gross differences in opportunity and outcome"
AP
5/13 Elizabeth Warren
The Massachusetts Senator has formally launched her bid for president in 2020. A progressive Democrat, she is a major supporter of regulating Wall Street.
Reuters
6/13 Cory Booker
The New Jersey Senator has announced that he will be running for the presidency in 2020. If he secures the nomination he said finding a female vice president would be a priority
Getty
7/13 Wayne Messam
Mayor of the city of Miramar in the Miami metropolitan area, Wayne Messam has announced his bid. He intends to run on a progressive platform against the "broken" federal government. He favours gun regulations and was a signatory to a letter from some 400 mayors condemning President Trump's withdrawal from the Paris Climate Accord
Vice News
8/13 Kirsten Gillibrand
The New York Senator formally announced her presidential bid in January, saying that “healthcare should be a right, not a privilege”
Getty
9/13 Kamala Harris
The former California attorney general will be running for president in 2020. Introduced to the national stage during Jeff Sessions’ testimony, she has endorsed Medicare-for-all and proposed a major tax-credit for the middle class
AFP/Getty
10/13 John Delaney
The Maryland congressman was the first to launch his bid for presidency, making the announcement in 2017
AP
11/13 Tulsi Gabbard
The Hawaii congresswoman announced her candidacy in January, but is likely to face tough questions on her past comments on LGBT+ rights and her stance on Syrian President Bashar al-Assad
Getty
12/13 Andrew Yang
The entrepreneur has announced his presidential candidacy, and has pledged that he would introduce a universal basic income of $1,000 a month to every American over the age of 18
Getty
13/13 Julian Castro
The former San Antonio mayor announced his candidacy in January and said that his running has a “special meaning” for the Latino community in the US
Getty
1/13 Joe Biden
The former vice president - poised to be a frontrunner - has announced his run. He recently faced scrutiny for inappropriate touching of women, but was thought to deal with the criticism well
EPA
2/13 Bernie Sanders
The 2016 runner-up has announced that he will be running again in 2020
Getty
3/13 Pete Buttigieg
The Indiana mayor and war veteran will be running for president. If elected, he would be the first openly LGBT+ president in American history
Getty
4/13 Beto O'Rourke
The former Texas congressman formally launched his bid for the presidency in March. He intends to run on a progressive platform, stating that the US is driven by "gross differences in opportunity and outcome"
AP
5/13 Elizabeth Warren
The Massachusetts Senator has formally launched her bid for president in 2020. A progressive Democrat, she is a major supporter of regulating Wall Street.
Reuters
6/13 Cory Booker
The New Jersey Senator has announced that he will be running for the presidency in 2020. If he secures the nomination he said finding a female vice president would be a priority
Getty
7/13 Wayne Messam
Mayor of the city of Miramar in the Miami metropolitan area, Wayne Messam has announced his bid. He intends to run on a progressive platform against the "broken" federal government. He favours gun regulations and was a signatory to a letter from some 400 mayors condemning President Trump's withdrawal from the Paris Climate Accord
Vice News
8/13 Kirsten Gillibrand
The New York Senator formally announced her presidential bid in January, saying that “healthcare should be a right, not a privilege”
Getty
9/13 Kamala Harris
The former California attorney general will be running for president in 2020. Introduced to the national stage during Jeff Sessions’ testimony, she has endorsed Medicare-for-all and proposed a major tax-credit for the middle class
AFP/Getty
10/13 John Delaney
The Maryland congressman was the first to launch his bid for presidency, making the announcement in 2017
AP
11/13 Tulsi Gabbard
The Hawaii congresswoman announced her candidacy in January, but is likely to face tough questions on her past comments on LGBT+ rights and her stance on Syrian President Bashar al-Assad
Getty
12/13 Andrew Yang
The entrepreneur has announced his presidential candidacy, and has pledged that he would introduce a universal basic income of $1,000 a month to every American over the age of 18
Getty
13/13 Julian Castro
The former San Antonio mayor announced his candidacy in January and said that his running has a “special meaning” for the Latino community in the US
Getty
Mr Weld said the evidence “goes well beyond what is required to support criminal charges of obstruction of justice.”
The letter was drawn up in response to Attorney General William Barr’s conclusion that the evidence was insufficient for a charge of obstruction of justice.
It argues there is evidence that Mr Trump attempted to fire Mr Mueller, limit the scope of the investigation and prevent witnesses from cooperating with investigators.
“To look at these facts and say that a prosecutor could not probably sustain a conviction for obstruction of justice – the standard set out in Principles of Federal Prosecution – runs counter to logic and our experience,” the letter says.
It came as members of the House Judiciary Committee announced plans to vote on Wednesday on whether to hold Mr Barr in contempt of Congress for failing to meet a deadline to provide a copy of the full, unredacted report and its underlying evidence.