Video report by ITV News Washington Correspondent Robert Moore

A long awaited report by special counsel Robert Mueller did not find evidence Donald Trump's campaign "conspired or coordinated" with Russia to influence the 2016 presidential election, the Justice Department says.

Mr Mueller also investigated whether Mr Trump obstructed justice but did not come to a definitive answer, Attorney General William Barr said in a letter to Congress summarising Mr Mueller's report.

The special counsel "does not exonerate" Mr Trump of obstructing justice, Mr Barr said, and his report "sets out evidence on both sides of the question".

After consulting with other Justice Department officials, Mr Barr said he and Deputy Attorney General Rod Rosenstein determined the evidence "is not sufficient to establish that the president committed an obstruction of justice offence".

In typical Trump style, he tweeted he has been cleared of any wrongdoing, along with his "Make America Great Again" slogan.

The White House disputes whether the President has been exonerated. Its press secretary, Sarah Sanders, said on Sunday Donald Trump has been “completely exonerated” by the report.

Ahead of boarding a plane, Mr Trump said the report gives him a "complete and total exoneration," of any wrongdoing.

He added: "It's a shame that our country had to go through this. To be honest it's a shame that your president has had to go through this."

In a statement, his campaign team said: "Today marks the day that President Trump has been completely and fully vindicated by special counsel Robert Mueller, exposing the Russia collusion conspiracy theory for the sham that it always was and catching Democrats in an elaborate web of lies and deceit."

Mr Barr released a four-page summary of Mr Mueller's report on Sunday afternoon. Mr Mueller wrapped up his investigation on Friday with no new indictments, bringing to a close a probe that has shadowed Mr Trump for nearly two years.

Mr Barr's chief of staff called White House counsel Emmet Flood on Sunday to brief him on the report to Congress. Mr Trump was at his Mar-a-Lago resort in Florida, about to return to Washington after spending the weekend there.

The House Judiciary Committee chairman said Mr Mueller "clearly and explicitly is not exonerating the president".

The investigation which shadowed President Trump for nearly two years ended last week. Credit: AP

Mr Barr said he and Deputy Attorney General Rod Rosenstein reached their conclusion without considering constitutional questions regarding bringing criminal charges against a sitting president.

The special counsel wrapped up his investigation on Friday, bringing to a close a probe that has shadowed Mr Trump for nearly two years.

Mr Mueller's investigation ensnared nearly three dozen people, senior Trump campaign operatives among them.

The probe illuminated Russia's assault on the American political system, painted the Trump campaign as eager to exploit the release of hacked Democratic emails to hurt Democrat Hillary Clinton and exposed lies by Trump aides aimed at covering up their Russia-related contacts.

Mr Mueller submitted his report to Mr Barr instead of directly to Congress and the public because, unlike independent counsels such as Ken Starr in the case of President Bill Clinton, his investigation operated under the close supervision of the Justice Department, which appointed him.

Mr Mueller was assigned to the job in May 2017 by Mr Rosenstein, who oversaw much of his work.

Mr Barr and Mr Rosenstein analysed Mr Mueller's report on Saturday, working to condense it into a summary letter of main conclusions.