The Russian Government made extensive efforts, through hacking of email as well as information warfare, to help US President Donald Trump win the 2016 election.
Multiple members of the Trump campaign knew of these efforts in advance.
Trump himself publicly called on the Russian Government to release information that would hurt Hillary Clinton and benefit him.
During the course of the election, Trump's campaign chairman exchanged polling data with someone who the FBI has said has ties to Russian intelligence.
Trump's son wrote "I love it!" when offered what he thought was dirt on Hillary Clinton from Russia.
Trump's camp maintained an elaborate business relationship with Russians who by definition had ties to the Kremlin - because all wealthy Russians have ties to the Kremlin.
And in every single one of these cases, the people involved lied extensively when questioned.
Even the Republicans who have welcomed Attorney-General William Barr's summary of Robert Mueller 's unpublished report have accepted them.
But according to that summary, it seems that they do not amount to an illegal conspiracy. Which can only mean one thing: There is something wrong with the law.
I say this even though I have argued for three years that the very worst things about Trump are the things that are public, visible, legal - and immoral.
His affinity for dictators, his scorn for American allies, his refusal to support US civil servants and US intelligence even while standing next to Russian President Vladimir Putin at a news conference - these are behaviours that should disqualify him from any sort of public office, let alone the presidency.
But in the course of this investigation, we have also learned that we are living in a new world - one in which the US public sphere is open to manipulation by anybody, not just Russia.
America's authoritarian enemies are now wealthy businessmen, not Mao-jacketed communists; and America's old-fashioned, we-all-believe-in-fair-play amateurish ethical norms are insufficient.
As Garry Kasparov wrote recently, "Putin and his imitators are good at finding the grey areas of public/private, legal/illegal, media/propaganda."
The agents of influence who look like rich businessmen, or "gun rights" activists, or lawyers - these are not the Soviet spies of yore.
They have plausible reasons to meet with people such as Jared Kushner or Ivanka Trump. They claim to be "investing," or "lobbying," and it is not easy to recognise them as agents of foreign states who wish the US ill.
In this new era, the US needs much tougher laws on conflicts of interest, and far more resources to enforce them.
- We need tougher laws on lobbying and money laundering, and far more resources to enforce them too, so that the Paul Manaforts of the future are caught long before they have spent years accumulating illegal wealth in exchange for political favours.
- We need to require presidential candidates to publish their income tax returns, and we need them to put financial interests in blind trusts, before they attain the presidency and not afterward.
- We also need laws on Internet advertising, and curbs on the anonymity that made it possible for trolls in St Petersburg to seek to influence American voters.
- We need laws that would make it impossible for a presidential candidate, or any politician, to secretly conduct business in a foreign country, any foreign country, while running an election campaign.
Like many others, I am reserving further judgment until I see the full version of the Mueller investigation report.
But it is worth concluding with this: Any Trump supporter who welcomes this report must also welcome the revelation of the facts I noted above, in the first paragraph of this column.
As it turns out, this was not a witch hunt.
It was the investigation of the worst electoral scandal in US history.
The flaws it has revealed in the US legal system, in electoral laws and in ethical assumptions should worry us profoundly.