Tunisia’s interim parliament was set to pass a much-delayed new constitution Sunday, after the failure to form a caretaker cabinet showed deep political discord.

Tunisia's interim parliament was set to pass a much-delayed new constitution Sunday, after the failure to form a caretaker cabinet showed deep political discord.

The Constituent Assembly's lawmakers have already vetted the new document line-by-line after negotiations on issues such as women's rights and the role of Islam.

Lawmaker Karima Souid said the parliamentary session during which the new constitution is expected to be approved was postponed from the morning to the afternoon.

The vote was now expected to start at 1500 GMT.

The charter needs the support of two-thirds of the 217 assembly members to pass.

Several Tunisian media outlets said the main sticking point in the negotiations for a new government was the identity of the interior minister.

But others, not only Ennahda supporters, argue that a volatile security situation across the North African country means that continuity is needed at the interior ministry.

Approval of the constitution is seen as a key step in Tunisia's political transition.

The vote, initially announced for Saturday, was pushed back until Sunday to allow lawmakers to reform the rules of the confidence vote.