Just a quick observation, which I hope to expand upon later. Critics and supporters of President Trump alike have noticed that not only has he failed to achieve anything important on his own in the 102 days he's been in office, but the failures more resemble "a bullshit artist who caves easily and is best either ignored" than one would expect from a self-professed master of the art of the deal. (On the other hand, he has successfully enriched himself and his family through corruption, and will continue to do so until someone stops him, so he hasn't failed in all his objectives.)
But his biggest failure might be not understanding the intense scrutiny of his office and how that affects his deal-making skills. If his entire fortune is based on bluster and bullshit, then having to do all of that in public all the time seriously undermines the strategy. Take Mexico, for example: after gearing up for an intense diplomatic battle with the administration, Mexicans have essentially realized Trump is a paper tiger, and have started ignoring him entirely. That will make it hard for Trump to get any kind of a deal from them.
In short: his success in private, one-on-one deals doesn't translate to public, multi-lateral, diplomatic and political dealing. And he was too ignorant or stupid to see that.
Still think he's a business genius?