Mr. Greenblatt got a very different message at an earlier dinner with two other prominent Palestinians, Salam Fayyad and Ziad Asali, and two American Jewish diplomats, Elliott Abrams and Dennis B. Ross. They all told him that a breakthrough was not realistic now, and that Mr. Trump would be better off pursuing incremental advances, like bettering the economic fortunes of the Palestinians.
“There is a perception that he’s fundamentally sympathetic, but there is an uncertainty about where he wants to go,” said Mr. Ross, a Middle East envoy for Presidents Barack Obama and Bill Clinton. “Among those who think there is no such thing as a deal, or that Israel is being asked to make troubling concessions, there is unease.”
So far, none of these objections are being made public. Conservative supporters of Israel view Mr. Trump as a vast improvement over Mr. Obama, whose blunt pressure on Israel to halt construction of settlements in the West Bank poisoned his relationship with Prime Minister Benjamin Netanyahu.
Mr. Trump has “done more in just 100 days than Barack Obama ever did in transforming the U.S.-Israel relationship into a U.S.-Israel partnership,” said Matthew Brooks, the executive director of the Republican Jewish Coalition.
But later this month, when Mr. Trump will test his ideas on his first foreign trip, to Saudi Arabia and Israel, one of his most powerful donors, the Las Vegas casino magnate Sheldon G. Adelson, will be in Israel when the president is, according to people briefed on his schedule.
Mr. Adelson was disappointed that…