I think the thing with Trump is just that he's kinda clueless about how the game is played, and as they say, in poker,,you can't bluff someone who doesn't know how to play, because they won't recognize when they're in a bad spot.
With someone like Nixon, he knew enough to see the writing on the wall and resign rather than getting kicked out. OTOH, with Trump, it seems like he doesn't know what the law says or why different norms are the way they are, so he just ignores them... and he seems to have lucked out to be president at a time when hyper-partisanship means that Republican officials will support "their guy" no matter what.and won't lose votes from Republican voters for doing it.
I don't think it's manipulation as much as just doing whatever he wants. I mean, he would break laws that didn't win him any advantage, either because he couldn't be bothered to follow them or couldn't be bothered to learn what they are.