Why then has Trump with support from Netanyahu pushed this scheme that is sure to further inflame the situation and incite people to war?
This scheme concocted by Trump and Netanyahu completely defies international public opinion and all attempts to achieve peace in the Middle East.
Corpus separatum (Latin for "separated body") is a term used to describe the Jerusalem area in the 1947 United Nations Partition Plan for Palestine. According to the plan the city would be placed under international regime, conferring it a special status due to its shared religious importance.
Most of the world still supports this... but not Donald J. Trump nor Benjamin "Bibi" Netanyahu... both of whom seem to prefer continued never-ending carnage, destruction and war to peace and friendship with people living in harmony with one another.
Jimmy Carter declared in 1980: "As to Jerusalem, we strongly believe that Jerusalem should be undivided, with free access to the holy places for all faiths, and that its status should be determined in the negotiations for a comprehensive peace settlement."
Obviously, there has been no "comprehensive peace settlement." Any such settlement will most likely once and for all make Jerusalem an "international city" contrary to the imperialist desire of Trump and Netanyahu.
By the way, had the proponents for establishing Israel in the first place not accepted Jerusalem being designated an "international city" Israel would not exist today.
In fact, many Israeli politicians have been opposed to Israel proclaiming Jerusalem the capital of Israel. Among the most notable of these politicians was one of the original founders of Israel and who had been the longest serving and a most respected elected member of the Knesset, Meir Vilner, who served from 1949 to 1990... some forty years.