Challenge the person's apparent hypocrisy by pointing out their objection to specific behaviors of Trump while seemingly condoning other questionable behaviors of Assange and themselves.
Yet it's okay with you that Trump saw a 10 year old girl and speculated about dating her later, and routinely walked in unannounced into the dressing rooms of 15 year old girls in various states of undress, including naked?  That he made comments about how he'd "probably" be dating his own daughter if she weren't his daughter, which shows how he thinks? The "pussy grab" comment was A-Ok with you?  Oh, and the fact that he holds accused sexual predator and rapist Julian Assange in such regard - as do you, correct?  -  is perfectly fine?