For evangelicals, Jerusalem is about prophecy, not politics (opinion) - CNN:

I doubt that President Trump could explain dispensational pre-millennialism. I doubt he knows the term. But his evangelical supporters know it. Some of his advisers are probably whispering these prophecies in his ears. Trump might not really care how they interpret the Bible, but he cares that white evangelicals continue to stand with him. Moving the embassy to Jerusalem is one way to affirm his commitment to these evangelicals -- reminding them that he, Donald J. Trump, is pressing biblical history forward to its conclusion and that he is God's man in the unfolding of these last days.