Barack Obama, the US president, has rejected Palestinian plans to seek statehood at the United Nations, and said Washington's commitment to Israel's security is "ironclad".
Obama was speaking at the annual policy meeting of American Israel Public Affairs Committee (AIPAC), the main pro-Israel lobby in the US, on Sunday amid unprecedented tumult in the Middle East and new strains in US-Israeli relations.
"No vote at the United Nations will ever create an independent Palestinian state," Obama said.
"And the United States will stand up against efforts to single Israel out at the UN or in any international forum. Because Israel's legitimacy is not a matter for debate."
On Thursday, the US president for the first time publicly called on Israel to accept a return to territorial lines in place before the 1967 Arab-Israeli war, with mutual land swaps with Palestinians, to frame a secure peace.
The formula was rejected by Binyamin Netanyahu, the Israeli prime minister, who told Obama at a White House summit on Friday that the 1967 borders were "indefensible".
That prompted Palestinian officials to say that they would seek recognition for Palestinian statehood in the UN General Assembly in September.
European Union states, UN diplomats say, are looking increasingly favourably on the idea of recognising a Palestinian state.
However, any statehood vote would have first to be approved in the UN Security Council, where the US - which insists on a negotiated peace accord - has a veto.
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