Former President Mohamed Nasheed, who led the annulled election with more than 45 percent of the vote, has accused Hassan of scheming to delay the election until his term ends and continue to hold power. Nasheed has demanded that Hassan resign and hand over government to the speaker of Parliament to oversee a new election.
Hassan has said that he does not intend staying in office beyond his term, but rejected calls to resign before that.
He withdrew from the revote after losing badly in the Sept. 7 election.
Hamid Abdul Ghafoor, a spokesman for Nasheed, said that he would contest the election set for new dates but insisted that Hassan must resign.
Nasheed's rivals at the election would be Yaamin Abdul Gayoom, a brother of Maldives' longtime autocratic ruler Maumoon Abdul Gayoom, and tourist resort owner Qasim Ibrahim.
Maldives, known as a luxurious vacation destination, has seen much upheaval in the five years it has been a democracy.
Nasheed, who was elected president in the country's first multiparty election in 2008 and defeated Gayoom's 30-year autocratic rule, resigned last year after weeks of public protest over his order to arrest a senior judge he perceived to be corrupt and partial.
A local commission on inquiry has dismissed his claim that he was ousted by a coup, but the country has since been politically polarized.