Remember that letter from Trump Junior claiming that his meeting with the Russian lawyer was all about adoptions? Yeah, The Donald wrote that.

Courtesy of WaPo: 

On the sidelines of the Group of 20 summit in Germany last month, President Trump’s advisers discussed how to respond to a new revelation that Trump’s oldest son had met with a Russian lawyer during the 2016 campaign — a disclosure the advisers knew carried political and potentially legal peril. 

The strategy, the advisers agreed, should be for Donald Trump Jr. to release a statement to get ahead of the story. They wanted to be truthful, so their account couldn’t be repudiated later if the full details emerged. 

But within hours, at the president’s direction, the plan changed. 

Flying home from Germany on July 8 aboard Air Force One, Trump personally dictated a statement in which Trump Jr. said that he and the Russian lawyer had “primarily discussed a program about the adoption of Russian children” when they met in June 2016, according to multiple people with knowledge of the deliberations. 

The statement, issued to the New York Times as it prepared an article, emphasized that the subject of the meeting was “not a campaign issue at the time.” The claims were later shown to be misleading.

It should be pointed out that this was immediately after Trump took that meeting with Vladimir Putin, during which Putin apparently talked to Trump about "adoptions." 

In other words Trump used language provided by Putin to issue a false statement about a meeting that his son, and other campaign personnel, had with Russian operatives during the 2016 campaign.

And this was after he fired James Comey for refusing to halt an investigation into his campaign's ties to Russia.

Like I said before, the evidence for collusion can literally be found everywhere.