Ambassador Samantha Power said that a resolution must "do no harm" to the ceasefire that has been holding in recent days and Israeli-Palestinian talks that are scheduled to resume in Cairo, and should "play a positive role in supporting a durable solution."
"Nothing underscores the urgency of securing ... A negotiated two-state solution like the crisis in Gaza and the heartbreak that so many people on both sides suffered throughout that crisis," she said.
She also criticised the failed US peace initiative by US Secretary of State John Kerry, saying it allowed Israel "to persist in policies" that she characterised as unilateral and abusive.
Power defended Kerry's mission and stressed that negotiations are the only way to achieve a two-state solution where Israel and Palestine live side by side in peace.
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"If you mean to secure a permanent peace, Israel has to be a part of that negotiation, just as a practical matter," Power said. "So to think that you can come to New York and secure what needs to be worked out on the ground is not realistic, and in fact, is likely to have very counterproductive effects."
A draft resolution circulated by the United States, Israel's closest ally, and obtained yesterday by The Associated Press calls for the re-establishment of full Palestinian Authority control over Gaza, which was ruled by Hamas militants who refuse to recognise the state of Israel.
The Security Council is also considering "elements" for a resolution proposed by European nations, and a Jordanian draft resolution backed by the Palestinians and their supporters which was written before the latest cease-fire.
The European proposal goes further than the Americans, calling for the establishment of an international Monitoring and Verification Mission in Gaza to ensure that the cease-fire agreement is implemented and to investigate reported violations.