"Israel has a full right to defend itself," Trump said at a joint news conference with Israeli Prime Minister Benjamin Netanyahu after a meeting between them, including any Iranian attack on Syrian territory.
The US president said any peace deal in the Middle East must be based on Israel's right to defend itself.
Since the June 1967 war, Israel has occupied about 1,200 square kilometers of the Syrian Golan Heights, a move not recognized by the international community, while some 510 square kilometers remain under Syrian sovereignty.
The plateau, which was previously part of the Syrian province of Quneitra, under international law, is occupied territory and is subject to UN Security Council Resolution 242 of 1967, which stipulates that Israel must withdraw from it.
In December 1981, the Israeli parliament adopted a law declaring Israel's sovereignty over the Golan Heights, but the UN Security Council rejected this resolution. The UN General Assembly also affirmed the illegality of the occupation of the Golan Heights, calling for its return to Syria.
In the occupied Golan, some 25,000 Druze are currently living in Syrian territory, compared to 23,000 Israelis, while Israeli authorities plan to expand their settlements in the area.
The source: Agencies