U.S. ambassador to Israel, David Friedman, said in remarks published on Thursday he expected Israel to keep the Golan Heights in perpetuity - an apparent contradiction of a statement made by Trump's national security adviser John Bolton during a recent visit to Israel.
Foreign governments, including the United States, do not recognise Israel's claim over the strategic plateau captured from Syria in a 1967 war.
However, Friedman suggested Israel was there to stay and said it was possible the United States would consider recognising Israeli sovereignty over the Golan Heights in the future.
"I personally cannot imagine a situation in which the Golan Heights will be returned to Syria. I frankly cannot imagine a situation in which the Golan Heights is not part of Israel forever," he told the right-wing Israel Hayom newspaper.
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Friedman said there was "no one more undeserving of this prize" - control of the Golan Heights - than Syrian President Bashar al-Assad.
Since early in Trump's term, Israel has lobbied for formal U.S. endorsement of its control of the Golan. Trump has recognised Jerusalem as Israel's capital, breaking with other world powers, but national security adviser John Bolton said last month a similar Golan move was not under discussion.
In the past year and a half, Trump has twice ordered U.S.-led air strikes against targets in Syria in response to what Washington called the Assad government's use of chemical weapons against civilians.
"Relinquishing the high ground of the Golan Heights could put Israel at a great security disadvantage," Friedman said.
The Golan Heights form a buffer between Israel and Syria of about 1,200 square km (460 square miles).
Israel captured most of it from Syria in the 1967 Middle East war. Israel annexed the territory in 1981, a move not recognised internationally.
Once willing to consider returning the Golan for peace with Syria, the Israelis have argued in recent years that the civil war in Syria and the presence there of an Iranian garrison backing Damascus show they need to keep it.
Interviewed by Reuters last month, Bolton said: "Obviously we understand the Israeli claim that it has annexed the Golan Heights - we understand their position - but there’s no change in the U.S. position for now."
Responding to those remarks, Israeli Prime Minister Benjamin Netanyahu said there "no way" he would give up to trying to win U.S. recognition.
Asked, in light of Bolton's comments, whether it was possible the Trump administration would consider at a future date recognising Israeli sovereignty, Friedman said: "Yes, that's definitely possible. It definitely could happen."