If there was anything important regarding Trump, it would have leaked prior to the election.
Trump knows he's in the clear. The only thing that can nail him now is a mistake when answering Mueller's interrogatories. Those are traps for someone to make even an arguable misstatement which will then be portrayed as a lie. In a more complex fashion, the questions are versions of "answer yes or no, have you stopped beating your wife."
The whole thing was a politically contrived crock of shit.
Russian interference, lol. Some Russians "linked' to the Russian government posted facebook ads which were critical of and mocked Democrat and Republican candidates, and sowed discord and fomented distrust in American institutions and candidates. Oh, no, a Russian lady said she had dirt on Hillary Clinton, and the Trumps would have been glad to hear about it! That's a threat to Democracy! Oh, no! Run! The Russians are coming! The Russians are coming!