I read that Ghislaine introduced Trump to Melania and that they first had sex on the Lolita Express.
Regarding potential blackmail, some posit that it's mostly voluntary i.e. you do some illegal act on camera for, for example, a rich Jewish financier. That way you demonstrate that you'll be loyal because they have this kompromat on you. Same reason gangs require you to maybe kill someone before you can join.
Epstein had boasted that he knew things that would have made Trump unelectable in 2016. On Hillary as well. Now obviously he does everything the Jews want him to do, not so much what his white US base wants. He reneged on all the important promises, Ukraine, no new wars and so on. Now many still think he's playing 4D chess, he will oust Zelensky, will stop Israel doing a new round of attacks on Iran, he only has Lindsey as his spokesman to placate the neocons, and he wont supply any meaningful arms to Ukraine nor sanction Russia, China and India and so on.