Key points:
Donald Trump will go ahead with the controversial move tomorrow
Arab leaders have warned it will further inflame the region
The decision to move the embassy breaks with policy that goes back almost to Israel's creation
Breaking with decades of US policy, Mr Trump has already told leaders of the Palestinian Authority and Jordan that he plans to move America's embassy from Tel Aviv to Jerusalem.
The decision has sparked fears of a new wave of violence in the occupied Palestinian territories and across the Arab world.
Already protesters have burned posters bearing Donald Trump's face at the Church of the Nativity in Bethlehem, in the West Bank, to voice their anger at the decision.
Move risks destroying the peace process
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Jerusalem is home to key Muslim, Christian and Jewish shrines, which have long been a flashpoint in the protracted Israel-Palestinian conflict.
The United Nations, in its 1947 plan on partition, resolved to place Jerusalem under a "permanent international regime" administered by the UN, meaning neither the Israelis or the Palestinians could claim the city as their capital.
That remains the UN position, even though Israel captured the old city and East Jerusalem from Jordan during the 1967 Six-Day War and has since passed laws declaring Jerusalem its "eternal and undivided capital".
In the decades since, the international community — including the US — has refused to recognise Israel's sovereignty over Jerusalem.