TEHRAN, Iran — For eight years, Iran President Mahmoud Ahmadinejad has played the role of global provocateur-in-chief, questioning the Holocaust, saying Israel should be erased from the map and painting U.N resolutions as worthless.

His provocative style grated inside Iran as well, angering the country’s supreme leader to the point of warning that the presidency could be abolished.

Now, a race is beginning to choose his successor, and it looks like an anti-Ahmadinejad referendum is shaping up. Candidate registration starts Tuesday for the June 14 vote.

Leading candidates assert that they will be responsible stewards, unlike the firebrand Ahmadinejad, who cannot run again because he is limited to two terms. One candidate criticized Ahmadinejad for “controversial but useless” statements. Others even say the country should have a less hostile relationship with the United States.

Comments from the presumed front-runners lean toward less bombast and more diplomacy. They are apparently backed by a leadership that wants to rehabilitate Iran’s renegade image and possibly stabilize relations with the West.

The result, however, may be more a new tone rather than sweeping policy change. Under Iran’s theocratic system, Ayatollah Ali Khamenei wields supreme power, making final decisions on nuclear and military questions.

The president acts as the public face of the country, traveling the world. A new president might embark on an international image makeover and open the door to less antagonistic relations with Iran’s Arab neighbors and the West.

The vote comes at a critical time in Iran, a regional powerhouse with about 75 million people and some of the largest oil reserves in the world. Nuclear talks between Iran and world powers are at an impasse while the Islamic Republic barrels ahead with a uranium enrichment program that many are convinced is intended for atomic weapons.

Iran also serves as the key ally of Syria’s President Bashar Assad, a mainstay so far helping keep him in power as rebels fight to oust him.

It is also in the middle of an apparent shadow war with Israel. Tehran has blamed Israel for deadly attacks on its nuclear scientists. Israel in turn has alleged Iranian attack plots on its diplomats or citizens around the world, including one where two Iranians were convicted of planning to attack Israeli, American and other targets in Kenya on Thursday.

Israeli Prime Minister Benjamin Netanyahu has warned repeatedly that Iran must be stopped from acquiring nuclear weapons, through use of force if need be.

While polls in Iran are unreliable, the tenor of the candidates’ speeches reflects a sense among the public that Ahmadinejad’s belligerent stance toward the rest of the world has not helped.