The primary source for the Steele Dossier was a suspected Russian spy

 That's right. The only "evidence" for Trump colluding with Russia is the Steele Dossier, paid for by Hillary Clinton, and the primary source for the contents of that report is a Russian who has had many contacts with Russian intelligence officers.

Igor Danchenko was investigated in 2009 to 2011.

The FBI/DOJ people who got warrants to spy on the Trump campaign knew this prior to asking for those warrants and didn't inform the court about Danchenko's past.

However the people running the investigation, Crossfire Hurricane, did deliberately distort the fact that Carter Page had worked with US intelligence to catch Russian spies.

So we've had more than 2 years of investigation based on absolutely nothing at all while the fact that Hillary Clinton paid a foreign national who then paid Russian sources with links to Russian intelligence services for rumors about Trump isn't even mentioned by the media as something wrong.

It's a massive case of projection by the dishonest Democrats who say that Joe Biden's son getting a $3.5 million dollar check from the wife of the former mayor of Moscow, a Russian oligarch, is not of interest.