Per AP reports:

Netanyahu said Obama told him that “he would never seek in any way to compromise Israel’s security, and that this would be sacrosanct in his approach to political negotiations.”

“In general, I think tough love is better than a free hand,” said Samson Altman-Schevitz, head of the Israel for Obama campaign. He moved to Israel two years ago from Chicago, where Obama’s wife, Michelle, was his adviser at the University of Chicago.
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