We already know American intelligence agencies intercepted numerous instances of Russian officials discussing their associations with various people in Trump's orbit in 2015 before Trump even declared his candidacy, but investigators are going back over all of them because of recent events.
According to officials who spoke to the Wall Street Journal, Donald Trump Jr's admission that he solicited dirt on Hillary Clinton from the Russians has prompted them to reexamine everything they have.
In some cases, the Russians in the overheard conversations talked about meetings held outside the U.S. involving Russian government officials and Trump business associates or advisers, these people said. [...]
The 2015 conversations were detected several months before Mr. Trump declared his candidacy for the White House. The conversations have been in investigators’ possession for some time, but officials said the Donald Trump Jr. news this week prompted them to look at them again.
I expect it will be a long time before any of this comes to fruition, but the idiocy of Trump and his spawn may land others in legal trouble before them.
Anyone who works with Trump is eventually humiliated. It's a law of physics.