But we also know that the Russian government did in fact interfere with our 2016 election through the spread of disinformation on social media in an attempt to tilt the election in Donald Trump’s favor.
And we know that on numerous occasions Russian agents communicated with Trump supporters, associates or members of Trump's campaign, among them:
...Donald Trump Jr.
We know that most of the above members - or rather, the former members - of Donald Trump's inner circle have been indicted on criminal charges or are now in prison for, among other crimes, lying under oath about communications with Russian agents who offered to assist in getting Donald Trump elected President of the United States.
We know that Don Junior and Jarrod Kushner were present at a meeting in Trump Tower with Russian agents and that Don Junior had solicited information from those agents to help his father's campaign. We know that it is a criminal offense to solicit contributions in any form from foreign agents to American campaigns.
We know that Jarrod Kushner failed to contact the FBI, as any decent American citizen should have, about the Trump tower meeting.
We know that during his presidential campaign Donald Trump was actively negotiating with the Russian government for a deal to build a Trump Tower in Moscow at the same time he was lying that he had no business dealings with Russia and praising Vladimir Putin.
We know that Donald Trump pressured James Comey to let Michael Flynn off the hook for his criminal offenses and not to pursue and investigation into Trump campaign collusion with Russia. We know that Comey refused to comply with Trump's demands and was subsequently fired.
We know that Robert Mueller opted to neither indict nor exonerate Donald Trump or any other members of his campaign on obstruction of justice charges, but rather collated all the evidence he had and turned it over to Attorney General Barr to make the decision on whether or not to issue any further indictments.
We know that Barr chose not to pursue any indictments of Trump, his associates or his family members.
We know that ever since the release of William Barr's synopsis of the Mueller Report Donald Trump has been behaving like a vengeful behemoth who's broken out of his cage and is coming for anyone who has angered him.
With Donald Trump's supporters and abettors in the Republican Senate already moving to keep the Mueller Report from being revealed to the American public, we may never know what Robert Mueller's investigators actually uncovered about Donald Trump and the machinations of his presidential campaign.
But we already know plenty.