CARACAS: Venezuela’s National Assembly meets on Saturday to elect its leaders in a session that also is expected to thrash out the country’s political future as President Hugo Chavez battles cancer in Cuba.

The elections will be a key political test for its current leader Diosdado Cabello, the regime’s number three and a perceived rival for power with Vice President Nicolas Maduro, Chavez’s handpicked successor.

Both men have denied persistent reports of a power struggle between them and vowed to maintain party unity.

In convening the session, Cabello called on Chavez supporters to rally outside the parliament building “to exhort revolutionary unity and head off the campaign of rumors.”

Cabello was expected to win reelection as president of the assembly, which is controlled by Cha-vez’s United Socialist Party of Venezuela. But if he fails to keep his post, it would give credence to the view that a fight for dominance in a post-Chavez Venezuela is already underway.

So far, Chavez has refused to relinquish power despite four round of surgery and debilitating complications that have kept out of public view in Havana for nearly a month, the longest stretch in his 14 years in power.

“The official version of what is happening is unsustainable,” said Ramon Guillermo Aveledo, the head of the main opposition coalition.

Aveledo said it would make more sense for the government to acknowledge “the truth” and use it to prepare the country for what is to come. But it “doesn’t want to admit that the president is absent.”

Maduro, for his part, vehemently rejected that position in a television appearance on Friday, laying out a legal rationale for delaying the swearing in for an unspecified period of time, while keeping Chavez in office.

With a pocket-sized constitution in hand, Maduro argued that the charter provides “a dynamic flexibility” that allows the president to take the oath of office before the Supreme Court at some later date.

It was the clearest signal yet that Chavez, who is fighting off complications from cancer surgery in Cuba, will not be taking the oath of office on schedule January 10.

Chavez was reelected to another six year term on October 7 despite his debilitating battle with cancer and the strongest opposition challenge yet to his 14-year rule in Venezuela, an OPEC member with the world’s largest proven oil reserves.

But he has not been seen in public since he underwent a long and complicated surgery for a recurrence of cancer in Cuba on December 11, and officials have acknowledged that his recovery has been difficult.

The rector of the Central University of Venezuela, Cecilia Garcia Arocha, proposed sending a team of medical experts to Havana to assess his condition. Opposition leader Antonio Ledezma said that it should include opposition figures.

Cancer was first detected by Cuban doctors in June 2011, but the Venezuelan government has never revealed what form of the disease Chavez is battling.

Beyond the constitutional controversies surrounding his prolonged absence, Venezuelans also are coming to terms with what the death or disability of their longtime leader.