Found in WaPo article:

"Trump barred Epstein from Mar-a-Lago “because Epstein sexually assaulted an underage girl at the club,” according to court documents filed by Edwards."

https://www.washingtonpost.com/national/palm-beach-trial-could-reveal-details-of-billionaires-alleged-abuse-of-teen-girls/2018/12/03/f42e0c4e-f4d0-11e8-bc79-68604ed88993_story.html