The Hamas leader's return to Palestinian territory, his first visit since 1967, coincides with the party's increased sway after an eight-day conflict with Israel and UN recognition of Palestine.
And there could well be more of it without them.
President Obama is hosting Israeli Prime Minister Benjamin Netanyahu, who has sharply criticized Obama's call for a return to 1967 borders, calling them 'indefensible.'
A recent escalation in violence between Gaza militants and Israeli forces has stoked fears that Israel will launch a ground invasion of Gaza as it did in December 2008.
Israel foreign minister said Tuesday that there was 'no chance' a Palestinian state would be established by 2012.
An Israel-Hamas prisoner exchange deal involving captured Israeli soldier Gilad Shalit may be imminent. But Gazans are disappointed that Israel's economic blockade of the Hamas-run Gaza Strip has been taken off the negotiating table.
Hamas agreed 'in principle' to an Egyptian proposal Monday that would give Palestinians a united front in peace talks with Israel.
A roadside bomb hits Israeli forces, and Israel responds with airstrike.
Hamas arrested senior Fatah officials in Gaza on Friday, capping off one of the worst weeks of conflict between the two Palestinian factions.