A prominent rival of president Mahmud Abbas called for the ouster of the veteran leader on Monday as Palestinians seek to organise a congress for the first time in nearly 20 years.
Mohammed Dahlan, once a leading figure in Abbas's Fatah party but now in exile in Dubai, took to his Facebook page to criticise the Palestinian president.
His comments came after Abbas resigned Saturday as head of the Palestine Liberation Organisation's Executive Committee in a bid to force new elections for the top body.
His resignation along with more than half of the 18-member committee will only take effect with a meeting of the Palestine National Council.
The PNC is a congress of 740 members representing those who live in the Palestinian territories and in the diaspora. It has not met since 1996.
The opposition saw Abbas's move as a political manoeuvre aimed at empowering his allies and marginalising opponents ahead of the 80-year-old's eventual retirement.
Dahlan, Fatah's former strongman in Gaza, however said the resignation of Abbas must be accepted and the future congress should "declare null and void all decisions by Abbas and his allies because they are illegal".
It should also "declare the State of Palestine and immediately call presidential and legislative elections," he said.
Dahlan was last year convicted in absentia of defamation and sentenced to two years in prison. He risks being jailed if he returns to the Palestinian territories.
He fell from grace in June 2007 after the humiliating rout of his forces by Hamas in week-long street battles that saw the Islamists expel Fatah from the Gaza Strip.
The Gaza-born politician was expelled from Fatah in 2011 over allegations of financial corruption and murder, and his name draws both loathing and admiration on the Palestinian street.