We're not talking evidence of crimes in those FBI files. These files have information on issues that would be the political death penalty for these politicians at election time, including personal details from dirty divorce fights, in-the-closet homosexuals, etc. Much of it is uncorroborated gossip gleaned from interviews during background checks...but many people will take it as gospel if leaked to the press by Hillary.
Actually the dem/press cut their thoats on this in that they throw so much forged dirt at the republicans that if they told the true, the voters would not know the difference and still think that they are lying.