If there was anything major on Trump, it would have been blasted all over the air by the media or one of his opponents. I doubt Trump himself would want the embarrassment should there be.
I guess that is the advantage of three marriages, (trading up) which would sink other candidates (like Newt). Or shaky business deals while invoking the
Kelo ruling (like trying to hire the lady's attorney away while she was fighting to keep her house, to represent landowners in another eminent domain case where a competitor was seeking properties which would have given that competitor an edge--an act which could have placed the attorney in conflict of interest had he gone for it.--some things by some people are not considered news. But if Ted Cruz' uncle's cousin's brother's dog pooped on the neighbor's lawn, that was taken to be proof positive that Cruz wanted to dump crap on everyone's golf-green like yards.
I guess how it is spun, but even more the emphasis placed on individual incidents which makes the difference between a 'big deal' and a 'nothingburger'.
We have seen this done with Bill Clinton who (on our dime, in a federal facility) had sex with an intern (in his chain of command), admittedly, and with physical evidence. Any CEO would have been fired for that, but the media dismissed it.
Had that been just 18 missing minutes of tape in the Nixon White House, someone would have been sent packing. (The charges, incidentally, were Perjury and Obstruction of Justice--in both instances).
Even with impeachment and evidence in the former case, the media successfully downplayed the event and he walked. In the latter, the issue was 24/7 (as much as there was 24) in the news cycle until he resigned.
It is the media who control what will be a story and what won't. In so doing they take the public eye off of --OH! SHINY! LOOK!