Trump often acts in delusional ways. I think he is a man who has always made his own rules and gotten away with it. Enough money will do that for you. However, he has also gotten away with it because he has operated in limited contexts - mostly in the realm of business.

My guess is that Trump will begin withdrawing troops from Europe at a slow pace. He will demand a renovation of the Iran Accord and get nowhere with this. There might be more US sanctions on Iran. However, the Iranians will not compromise with Trump, and barring a naval confrontation in the Persian Gulf, it will be US businesses that will suffer and Trump's frustration level that will go up.

Specifically in reference to Iran, Donald Trump will not be able to renegotiate the nuclear arms pact. His attempt to do so will alienate all the European powers involved and will cost a number of US companies some very lucrative contracts. It is a losing proposition for him and for the US. Much more so than for Iran, who will turn more and more to Russia and China as trading partners.

Under Trump, the US will give its blessing to Israeli imperialism and racism.

With the exception of Obama's belated lame-duck behavior, the US has always, in practice, supported Israel unquestionably.

If Trump takes an aggressive anti-Iranian stand, I suspect it will complicate his relations with Russia; how much so, depends on what else Trump does, particularly about participation in NATO.

The question is: Will Trump's ego allow him to reconsider any negative moves that he now might have in mind? Such reconsideration is really out of character for him.