Much like other swine, Trump feels completely at home covered in piss and shit and in fact seeks this lifestyle actively in his personal life.
Don't know if he was seeking after it, but he sure got it.
When you look back on Trump, he used to be a modest, mild-mannered and polite man. But over the years, he just turned into a rampaging bull. Maybe it's all of the, to be honest, mostly manufactured paparazzi "scandals" in his day that turned him sour.
In any case, he has 30+ years of experience on other politicians, when it comes to dealing with controversy, scandals and outrage. So on those terms, he's not going to be beat. There's likely nothing that hasn't already been dug up on this guy, and whatever is left, probably won't come off as too shocking based on what's already been out there. I'd actually be very surprised if there's anything that "takes him down", that isn't a result of his own actions to torpedo his political career.
He knows the basic ground rules on how to "strong-arm" the media types, which are to never apologize, or admit to a fault or a mistake, because showing weakness makes you an easy target. While other politicians waste time apologizing and correcting their words, he has broken the game by absolutely not giving a shit.
When people vote for a leader, a lot of times they vote based on their esteemed strength. Regardless of whether it's a show of "good character" or not, a lot of people are not going to vote for a candidate that caves in at the first sight of pressure, to apologize for offending people's sensibilities. Because they will then inevitably start wondering how this same person can deal with the sharks on the global stage, who will not care for apologies, who will strike where the opposition is at their weakest.
Before the Bernie Sanders type candidates can be taken seriously, they'll need to learn a lesson or two on how to project strength through their words and actions. You don't need to bullshit your way through it, but you do need to possess that kind of character, in some shape or form.