So in 6 months there is another Intifada as the US relocates its embassy. Thousands die. The Middle East gets even more inflamed. 
Iran plays into Trump's hand by letting one of its gunboats get too close to an American warship. It is under orders, as in "Gulf of Tonkin" times, of finding an excuse to ratchet up fighting against Iran. We go to war with Iran. 
They unleash hundreds of thousands of troops at Israel. It uses an atomic device. The entire Middle East goes to war with the US and Israel. We lose a lot of our oil, and the world has to take sides.
That is as far as my nightmare goes....
We are so screwed, thanks to low income Republicans who actually thought Trump wasn't a liar. Thanks to Putin and to Comey.
Hugh Massengill, Eugene Oregon