There was collusion, they know there was collusion, and they knew it was wrong.

Assuming that this reporting bears out, in the same way that every other piece of reporting on this story has been borne out, I don't see how any other conclusion can be drawn. From CBC News:

Former White House chief strategist Steve Bannon called a June 2016 meeting with a group of Russians attended by Donald Trump Jr. and his father's top campaign officials "treasonous" and "unpatriotic," according to excerpts from a new book seen by Reuters on Wednesday.

Bannon expressed derision and astonishment over the meeting in Trump Tower in New York in which a Russian lawyer was said to be offering damaging information about Democratic presidential candidate Hillary Clinton, according to the book Fire and Fury: Inside the Trump White House by Michael Wolff.

The meeting, arranged by Trump's son, also included Trump's son-in-law, Jared Kushner, and then-campaign chairman Paul Manafort. It has become part of a federal investigation into potential collusion between the Trump campaign and Russia in the election. Trump has denied any such collusion.

"The three senior guys in the campaign thought it was a good idea to meet with a foreign government inside Trump Tower in the conference room on the 25th floor — with no lawyers. They didn't have any lawyers," Bannon says in the book excerpts seen by Reuters.

"Even if you thought that this was not treasonous, or unpatriotic, or bad shit, and I happen to think it's all of that, you should have called the FBI immediately."

[...]

Bannon was incredulous about the meeting shortly after it was revealed, according to the book, concluding sarcastically: "That's the brain trust they had."

Boy, Steve Bannon is just a gift that keeps on giving, isn't he?

Trump is, naturally, denying everything ("When he was fired, he not only lost his job, he lost his mind," looks to be the Trump quote du jour), but he and everyone else associated with him have categorically denied absolutely everything else up to now, only to be proven over and over and over again to be outright lying. And Trump lies habitually anyway, even when the truth is not only easily knowable but probably would better serve him.

I've been saying this for a while now, but I'm going to say it again: Trump is guilty, and his presidency is going to end badly and earlier than scheduled. If the GOP-controlled Congress doesn't throw him under the bus before the mid-terms, then the Democratically-controlled Congress which looks poised to replace them almost certainly will. That's assuming that Robert Muller doesn't bring him down first.

I can't even gloat over Trump's inevitable downfall from safely north of the 49th parallel, in part because the damage that Trump is doing while still in office is global in scope, but also because watching your friends suffer (and American is a long-time friend of Canada) is just no fun at all. Ye gods, what a mess...

I stand by my earlier assertion: Trump's disastrous presidency is doing damage to America, and to our planet, that will take generations to undo, and the end of America as the leading nation of the world is happening as we watch. And while I know that the nature of empires is to end, it's still weird to watch it happen to your next door neighbour.

UPDATE:

Trump's lawyers have now issued the emptiest of all possible threats to sue Steve Bannon over this, simultaneously confirming that everything described in the Wolff book actually did happen. Coverage of this late development comes courtesy of Lawrence O'Donnell at MSNBC.