This totally falls into the category of conspiracy theories, and there is no proof of this happening that is revealed to the public, but if this were the case, as I wrote ast week in the post, Firing Comey the Mother of all Political Bombs, "The unanswered questions. What new evidence could have the FBI found? Would it have been Trump himself actual coordinating with the Russians during the 2016 campaign (aka treason) or that Trump told a lie about his business dealings with the Russians? Was money laundering or financial crimes were involved because a recent request to the Treasury department showed FBI investigators pursuing that angle? Or was Trump himself "compromised", open to blackmail by the Russians? The FBI viewed the investigation as Russian activities that involved espionage (counter intelligence) but not criminal activity, so it is not just matters of lying in sworn testimony or failure to file disclosure of being a foreign agent or failure to fill out a tax return correctly. Or is there something else? This is the time to get Trump's tax returns he has worked so hard to conceal, if the latter is a tree the FBI was barking up. An important clue may be in that. "
. In a blog posting May 13, Is It Time to Talk Impeachment", "What seems to me most likely is that Trump's business dealings with Russia, loans and investments in his businesses, may have compromised Trump himself, opening him to blackmail. That could also explain his “bromance” with Putin and his campaign advocacy for policies in synch with Russia’s, denial that there was any Russian interference in 2016 elections in spite of all intelligence agencies testifying to the contrary. It also explains why he as taking been great pains to keep his tax filings secret."
Update 5/19/17: Special prosecutor turns focus to financial dealings: https://www.washingtonpost.com/world/national-security/russia-probe-reaches-current-white-house-official-people-familiar-with-the-case-say/2017/05/19/
You can make this stuff up into a who dunnit political conspiracy theory legal issue fiction novel. I am a real fan of John Grisham and I have read nearly every book he has written. His first breakthrough novel The Firm educated the world how money laundering worked and the role off-shore banks played in it.
Of course, some times real life and truth are stranger than fiction.