He had a decades-long, close friendship with Epstein, and a documented, admitted history of vile behavior with women and girls. You can guess what kompromat would look like.
Well there's not much conspiracy theorizing. Politico article:
>The top level of the Soviet diplomatic service arranged his 1987 Moscow visit. With assistance from the KGB. It took place while Kryuchkov was seeking to improve the KGB's operational techniques in one particular and sensitive area. The spy chief wanted KGB staff abroad to recruit more Americans... https://www.politico.com/magazine/story/2017/11/19/trump-fir...
Which doesn't prove Trump did bad stuff but does kind of show the KGB were trying.
Cultivating is maybe a bit strong but befriending maybe. After that trip he ran ads opposing US overseas military spending so not so different to what we have now.
That recites a book from a Trump hating Guardian reporter.
Why would the CIA let him become president if they actually had something on him? Why would they let Gabbard (also called a "Russian asset") become DNI if they had something on her?