Palestinian Authority Chairman Mahmoud Abbas convened the PLO's top decision-making body on Friday to map out a strategy after declaring that talks to form unity government with ruling Hamas militants had collapsed. Abbas has two options, both problematic for him - fire the Hamas-led government or hold a national referendum on whether to call early elections. Recent polls have shown that Abbas' Fatah Party would not have enough support to oust the militantly anti-Israel Hamas in new balloting. But if he dismisses the Hamas Cabinet, the Hamas-dominated parliament would veto any new government he appoints, leading to a constitutional crisis that could force elections.