Nothing in particular. Put anyone in D.C. under the same microscope and you'll find as much. The biggest fish caught, Manafort, was a high level political operative for decades and has been involved in multiple admins.
FBI was already looking into Manafort.
FBI was already looking into Flynn.
FBI was already looking into Russia's interference.
Why later, was a microscope put on Team Trump specifically? Don't be partisan...just discuss clinically. Because Trump's team was lying about Russia connections, acting like they were in bed with Russia, and the catalyst, firing Comey because of Russia. Trump put Trump under a *REPUBLICAN* microscope. Democrats had zero power, sorry.
Contrast to Hillary, who was put under a microscope by partisans for doing her job, for years. What did they turn up? Prosecutable crimes? No.
Contrast that to Bill under a microscope by a partisan for 4 years under the partisan Starr. What did they turn up? An affair coupled with setting up so he could perjure himself.
What about Obama, after all the nutty attacks...birther ism wasn't even taken seriously...what about fast and furious? Not directed by Obama. 8 years of Republican's hounding him, yielding how many crimes?
So no, putting them all under a less legitimate microscope, yielding nothing.
No, Republicans in recent history have racked up the most indictments of their team in office by leaps and bounds.
Team Trump scared their own administration with their stupidity. Some had to be indicted and jailed, and the scope is so large that it's expanded well beyond the bounds of the SC now.