US President Donald Trump has reportedly vowed to help Israel ensure that Iran does not bolster its power and influence in the Middle East, in particular by filling the power vacuum in Syria.

"The US will not allow Iran to take over Syria. The US will not leave Israel alone in this arena," a senior US official quoted Trump as saying in remarks to the daily newspaper Israel Hayom.

Israel has warned that it will use any means necessary to prevent Iran from establishing a foothold in Syria, and especially to deny the transfer of game-changing weaponry to Iran's Lebanese proxy, Hezbollah.

Trump will reportedly meet privately with Prime Minister Benjamin Netanyahu next week when the two attend the opening of the UN General Assembly.

Netanyahu is said to be preparing an outline for significant chances to the Iran nuclear deal that he intends to present to Trump.

PHOTO: Netanyahu meets with President Trump at Ben Gurion Airport (FLASH90)