With the exception of Obama's belated lame-duck behavior, the US has always, in practice, supported Israel unquestionably.
Lawrence DavidsonTrump might well choose to renege on US obligations (so much for the sanctity of contracts!) and no doubt he would have the agreement of Zionist politicians like Schumer. But the consequences will be the increased isolation of the US - particularly from Europe, whose businesses will just move into Iran while US companies will lose out.
Lawrence DavidsonTrump 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.
Lawrence DavidsonMy 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.
Lawrence Davidson