RIYADH (AP) ― Saudi Arabia’s ruling monarchy moved into a critical period of realignment Saturday after the death of the heir to the throne opened the way for a new crown prince: most likely a tough-talking interior minister who has led crackdowns on Islamic militants but also has shown favor to ultraconservative traditions such as keeping the ban on women voting.

A state funeral is planned for Tuesday in Riyadh for crown prince Sultan bin Abdul-Aziz Al Saud, who died in New York at the age of 80 after an unspecified illness, the official Saudi Press Agency said.

Now, Saudi rulers are expected to move quickly to name the new king-in-waiting ― which royal protocol suggests will be Sultan’s half brother, Prince Nayef.

Moving Nayef to the top of the succession ladder would not likely pose any risks to Saudi Arabia’s pro-Western policies and, in particular, its close alliance with Washington. But Nayef cuts a much more mercurial figure than Saudi’s current leader, the ailing King Abdullah, who has nudged ahead with reforms such as promising women voting rights in 2015 despite rumblings from the country’s powerful religious establishment.

Nayef, 78, has earned U.S. praise for unleashing the internal security forces against suspected Islamic extremist cells in Saudi Arabia, which was home to 15 of 19 of the Sept. 11 hijackers. Yet he brought blistering rebukes in the West for a 2002 interview that quoted him as saying that “Zionists” ― a reference to Jews ― benefited from the 9-11 attacks because it turned world opinion against Islam and Arabs.

Nayef also has expressed displeasure at some of Abdullah’s moves for more openness, saying in 2009 that he saw no need for women to vote or participate in politics. It’s a view shared by many Saudi clerics, who follow a strict brand of Islam known as Wahhabism. Their support gives the Saudi monarchy the legitimacy to rule over a nation holding Islam’s holiest sites.

“Nayef is more religious, and is closer to the Saudi groups who are very critical of the king’s decisions regarding women and other steps he’s taken to balance out the rigid religious practices in society,” said Ali Fakhro, a political analyst and commentator in Bahrain.

But it remains doubtful that Nayef ― if ever made king ― would outright annul Abdullah’s reforms, which include the establishment of a coed university where both genders can mix. More likely, Nayef would put any further changes on hold, said Abdulkhaleq Abdulla, a political affairs professor at Emirates University.

“It’s not good news for Saudis or for the region,” he said. “(Nayef) is the security guy. He is the mukhabarat (secret police) guy. He is the internal affairs guy.”

Although it’s not certain that Nayef will be selected to succeed Sultan, the signs point clearly in that direction.

After Sultan fell ill two years ago, Nayef was named second deputy prime minister, traditionally the post right behind the crown prince. For the first time, however, the mechanism of picking the next No. 2 in the royal succession is not entirely clear.

Traditionally, the king names his successor. But this time it is possible that Abdullah will put the decision to the Allegiance Council, a 33-member body composed of his brothers and cousins. Abdullah created the council as part of his reforms and gave it a mandate to choose the heir.

Abdullah formed the council in order to modernize the process and give a wider voice. When it was created, it was decided that the council would choose the heir for the first time when Sultan rose to the throne, and his crown prince would need to be named. But it was not specified whether it would be used if Sultan died before the king.

The choice of whether to convene the council now will likely be made by the 87-year-old Abdullah, who is currently recovering from his third operation to treat back problems in less than a year.