There was a LOT of stuff linking Russia and the Trump campaign directly: Junior's Trump Tower meeting being one of dozens of such links, but insufficient direct evidence of a conspiracy or coordination between the Campaign and the Russians, other than Roger Stone, who lied to Congress and the FBI when questioned.
Then you have Paul Manafort pleading guilty to handing GOP voter data over over to a Russian spy.
If Trump had the first clue on "how things are done", he wouldn't have been arrested for fraud.
Donald Trump is always saying he knows better than anybody else. Yeah, that's why his companies went bankrupt 7 times. That's why no one will lend money to him. That's why everything he does creates chaos and destruction..