One thing that is pretty clear from this report however, is Mueller's statement that "the investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities".
Though it took him nine hours to review the 22-months worth of findings, Barr's summary, released March 24, was just four pages long.
But on the issue of whether justice was obstructed, Mr Mueller's report says: "While this report does not conclude that the president committed a crime, it also does not exonerate him".
Asked last week about publicly releasing the report, Trump said: "Let it come out". The "difficult issues of law" could be referring to the only legal guidance we have on the topic, a Department of Justice memo stating that "The indictment or criminal prosecution of a sitting President would unconstitutionally undermine the capacity of the executive branch to perform its constitutionally assigned functions". Barr says Mueller's report presents "evidence on both sides" of that question.
The South Carolina Republican, who spent the weekend with Trump, told reporters on Monday that "if President Trump pardoned anybody in his orbit, it would not play well".
Rep. Ro Khanna, a California Democrat on the House Oversight panel, said there are "still outstanding questions" on Trump-Russia connections, adding that it's unclear whether Mueller looked into Trump's actions over Russia during his presidency.
"The fact that Special Counsel Mueller's report does not exonerate the president on a charge as serious as obstruction of justice demonstrates how urgent it is that the full report and underlying documentation be made public without any further delay", the Democratic leaders said in a statement.
Kremlin spokesman Dmitry Peskov, in a on a conference call with reporters, called on Washington to make the first move to reset ties and repeated Moscow's denial of any interference in USA elections and internal affairs or those of any other country.
And in the run up to Trump's reelection bid, what direction for USA democracy going through what's arguably its biggest crisis of confidence in its institutions in half a century since the Watergate Scandal and the Vietnam War?
Even the infamous meeting the president's son Donald Trump Jr. and other campaign advisers held in "Trump Tower" with a Russian lawyer, who had ties to the Kremlin and who sought to provide them with incriminating information about Hillary Clinton, apparently did not constitute a crime to investigators. The special counsel instead declined to determine whether the president had illegally attempted to shut down the investigation into him - and left it to Barr's Justice Department, which found there was not enough evidence to show obstruction of justice.
He's referring to figures such as Paul Manafort, Trump's former campaign chairman.
JD Gordon - National security director on Donald Trump's 2016 Presidential Campaign. The special counsel also detailed extensive contacts between Trump associates and Russian Federation. Mueller reached no conclusion on whether Trump obstructed justice.