At an emergency session, the UN General Assembly will decide on a draft resolution reaffirming that Jerusalem is an issue that must be resolved through negotiations and that any decision on its status has no legal effect and must be rescinded.
The measure was sent to the General Assembly after it was vetoed by the United States at the Security Council on Monday, although all other 14 council members voted in favour.
Trump's decision on December 6 to recognise the city as Israel's capital broke with international consensus and unleashed protests across the Muslim world, prompting a flurry of appeals to the United Nations.
But Trump warned that Washington would closely watch how nations voted, suggesting there could even be reprisals for countries that back the motion which was put forward by Yemen and Turkey on behalf of Arab and Muslim countries.
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"They take hundreds of millions of dollars and even billions of dollars and then they vote against us," Trump said at the White House.
The draft resolution mirrors the text that was vetoed on Monday, and although it does not mention Trump's decision, it expresses "deep regret at recent decisions" concerning the city's status.
Ahead of the vote, Israel's Prime Minister Benjamin Netanyahu blasted the UN as a "house of lies," saying Israel "rejects outright this vote, even before it passes."
"The attitude to Israel of many nations in the world, in all the continents, is changing outside of the UN walls, and will eventually filter into the UN as well - the house of lies," he said.
On Tuesday, US Ambassador Nikki Haley sent an email to fellow UN envoys to put them on notice that "the president will be watching this vote carefully and has requested I report back on those countries who voted against us."
"We will take note of each and every vote on this issue," she wrote in the message seen by AFP.
And on Twitter she said "the US will be taking names" when ambassadors of the 193-nation assembly cast their votes.
But Turkish President Recep Tayyip Erdogan today said UN member states should not be swayed by Trump's threat.
"I am calling on the whole world: never sell your democratic will in return for petty dollars," he said in a televised speech in Ankara.
Erdogan said he believed that "the world will teach a very good lesson to America today (today)."
A council diplomat said Canada, Hungary and the Czech Republic might bow to US pressure, but the motion is all but certain to be approved.
No country has veto powers in the General Assembly, unlike in the 15-member Security Council where the United States, along with Britain, China, France and Russia, can block any resolution.
Palestinian foreign minister Riyad al-Malki accused Washington of "threatening" member-states, saying the UN session would show "how many countries will opt to vote with their conscience."
While resolutions by the General Assembly are non- binding, a strong vote in support of the resolution would carry political weight.
Israel seized the largely-Arab eastern sector of Jerusalem during the 1967 Six-Day War and later annexed it, claiming both sides of the city as its "eternal and undivided capital."
Several UN resolutions call on Israel to withdraw from territory seized in 1967 and the draft resolution contains the same language as past motions adopted by the assembly.