Obama can't afford to let history repeat itself in the Middle East.
The Palestinian Authority's decision to postpone a vote on the Goldstone report last week is the last straw for many, sparking protests in the West Bank and Gaza.
Hamas Prime Minister Ismail Haniyeh said Sunday that Palestinians would reject anything rival Palestinian leader Mahmoud Abbas agrees to during this week's talks with President Obama and Israeli Prime Minister Benjamin Netanyahu.
The US Mideast envoy called the meeting "good" but didn't say whether he discussed a settlement freeze, which Palestinians have called a prerequisite to peace talks.
On Tuesday, the Palestinian president convened his party's first congress since 1989 to strengthen its position in negotiations with Israel, Hamas.
Ahead of a major Fatah leadership conference, the Arab TV network reported Tuesday that President Mahmoud Abbas had been involved in an assassination plot against his predecessor, Yasser Arafat.
Israeli Prime Minister Benjamin Netanyahu said Monday that he's ready for immediate talks with the Palestinians, but he won't endorse a Palestinian state.
With nod from China, it will attend next month's World Health Assembly, but only as an "observer."
But Prime Minister Salam Fayyad's surprise move, some say, could pressure Palestinian rivals Fatah and Hamas to reach an agreement in Cairo.