Story here - US to recognise Jerusalem as Israel's capital in world first - BBC News
First Trump has gone after the Islamic radicals in Saudi, Qatar, Iran and the rest of the middle east.
Now this. - The Jerusalem issue is one of the central point for today's Islamic radicals.
I think Arafat summed this up well after the signing of the Oslo accords in this speech:
http://www.textfiles.com/politics/arafat.txt (a must read, BTW).
Or, in the radicalised Palestinians who the clerics deploy as pawns, again they always explicitly say that Jerusalem is the central issue for them.
This is going to set the Islamicists right off, no doubt about it.