The officials said numerous logistical and security details, as well as site determination and construction, will need to be finalized first.
Russian President Vladimir Putin phoned Palestinian President Mahmoud Abbas on Tuesday to say Moscow backs a resumption of talks between Israel and Palestinian authorities, including on the status of Jerusalem, the Kremlin said.
In 1995, Congress passed a law requiring the American embassy to be relocated to Jerusalem. Israel had imposed new security measures at the compound, also known as the Temple Mount, following the killing of two Israeli policemen by Palestinian attackers.
A senior administration official said Trump would make the announcement - ignoring frantic warnings from US allies in the region and around the world - at 1:00 pm (1800 GMT) from the White House.
"Recognizing that Jerusalem is the capital of Israel I think would make a very significant change", said Sheldon Schorer, the former chair of Democrats Abroad Israel, in a conference call with reporters.
The Israel Defense Forces (IDF) are preparing for violence after Hamas called for a "day of rage" in response to Trump's controversial decision.
In an appeal at the end of his weekly general audience, Francis called for all to honour United Nations resolutions on the city, which is sacred to Jews, Christians and Muslims. "In Jerusalem, we don't cave to pressure and we don't let threats or violence stop us from doing what is right". Palestine will be "freed" and the people of Palestine will reach victory.
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. The Republican president formally endorsed Moore on Monday and directed the Republican National Committee to send some financial assistance after withdrawing roughly a dozen staffers last month. His son-in-law and close adviser, Jared Kushner, is leading that effort and a close aide, Jason Greenblatt, has crisscrossed the region for talks with Israelis, Palestinians and other Arab leaders.
Trump's move comes close to fulfilling a campaign promise, and will delight his political donors and the conservative and evangelical base so vital for the embattled president.
Turkish President Recep Tayyip Erdogan threatened to break off diplomatic ties with Israel if Trump goes ahead with his campaign pledge to recognize Jerusalem as the capital of the Jewish state.
Palestinians worried about the impetus this would give to new settlements, and with good reason as 20 years later there are 200,000 Israeli settlers and 370,000 Palestinians in East Jerusalem.
The analyst stressed that the Arabs renewed commitment to peace with Israel when they adopted the 2002 Arab peace initiative, which offered Israel normal ties with the Arab world in return for their withdrawal from territories it occupied in 1967. Netanyahu's office and official residence are in Jerusalem, as are the country's parliament, Supreme Court and Foreign Ministry. "The whole world is reacting, and the whole world is against the possibility of this decision". "Not only [in] the Muslim world". Because inevitably, there will be a response and we can almost guarantee that protests against this move will be put down in the most violent terms and, tragically, that people will die.
"Wrong steps in this direction would bring irreversible consequences", he said, adding that such a move could "bring a new conflict between religions".