Assange was asked on one of the Fox shows; why he didn't report on Trump, Assange said what came out of Trump's mouth was already outrageous enough. Then, I think he did say they had something on him.
"In November 2010 Assange was alleged to have committed several crimes against two different women during a visit to Sweden that August. He was wanted for questioning in Sweden over two counts of sexual molestation, one count of unlawful coercion and one count of "lesser-degree rape" (mindre grov våldtäkt). Assange denies the allegations.[145][146]
After 18 August 2015, Assange could no longer be charged for all three of the less serious allegations, as the Swedish prosecutors did not succeed in interviewing Assange before the statute of limitations for these alleged crimes ran out. However, he is still wanted for questioning over the allegation of rape. The preliminary investigation still continues as the statute of limitations here will only expire in 2020.[147][148][149][150][151]"
https://en.wikipedia.org/wiki/Julian_Assange#Swedish_sexual_assault_allegationsSure, he should stand trial if one is warranted, apparently nothing has been decided in court yet though.