US Attorney General William Barr has delivered the main findings of the Mueller report to Congress.

Members of Congress received the four-page letter this afternoon, just days after the conclusion of the investigation into alleged Russian meddling in the US 2016 presidential election.

US President Donald Trump has always denied collusion with his campaign, calling the inquiry a 'witch-hunt'.

The US Justice Department says it has found no evidence of collusion - but it also does not exonerate the president on the subject of obstruction.

The letter quotes the special counsel as saying: "The investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities."

Mr Barr explains that report is split into two sections - one on Russian interference, and another on whether President Trump's actions have amounted to obstruction of justice.

The report's quoted as stating: "While the report does not conclude that the President committed a crime, it also does not exonerate him."

Mr Barr goes on to say that he and Deputy Attorney General Rod Rosenstein have determined that the evidence presented is not sufficient to determine whether President Trump committed an obstruction-of-justice offence.

As has been publicly documented, the letter details that Mr Mueller found that Russian interference in the election amounted to main strands:

• efforts at disinformation and social media operations to "sow social discord"
• hacking operations aimed at releasing information to influence the election campaign, such as documents from the Hillary Clinton campaign.

Reaction

Responding to the report, President Trump suggested it was a "complete and total exoneration".

However, senior Democrats reiterated their calls for the full Mueller report to be released.

Jerry Nadler, chairman of the House Judiciary Committee, observed: "There must be full transparency in what Special Counsel Mueller uncovered to not exonerate the President from wrongdoing.

"[The Department of Justice] owes the public more than just a brief synopsis and decision not to go any further in their work."

In light of the very concerning discrepancies and final decision making at the Justice Department following the Special Counsel report, where Mueller did not exonerate the President, we will be calling Attorney General Barr in to testify before @HouseJudiciary in the near future.

— Rep. Nadler (@RepJerryNadler) March 24, 2019