In a significant development, Mojtaba Khamenei, a son of Iran's late supreme leader, has been named his successor, Iranian state TV announced early on Monday, as the war that began a little over a week ago with his father's killing took a dramatic turn. The younger Khamenei, who had not been seen or heard from publicly since the war started, had long been considered a contender for the post, even before an Israeli strike killed Ayatollah Ali Khamenei, and despite never being elected or appointed to a government position.

His appointment comes after signs of a rift among Iranian officials
His appointment came after signs of a rift among Iranian officials as the country awaited a decision by the Assembly of Experts, a group of clerics that selects the supreme leader. State TV read a statement from the assembly, saying he was selected based on "strong" votes and urging the nation to unite behind him.

The station broadcast scenes of people celebrating in parts of Tehran. There has been only one other transfer of power in the office of supreme leader since the Islamic Revolution almost a half-century ago.

A secretive figure, the 56-year-old Khamenei now stands at the heart of Iran's theocracy and will have final say over all matters of state. He will serve as commander-in-chief of the military and powerful paramilitary Revolutionary Guard. He also has authority over a stockpile of highly-enriched uranium that could be used to build a nuclear weapon, if he chooses to decree it.

Selection of Khamenei faces the likelihood of US criticism
The selection of Khamenei faces the likelihood of US criticism. "Khamenei's son is unacceptable to me," US President Donald Trump has said. "We want someone that will bring harmony and peace to Iran."

The White House did not immediately respond to a request for comment. Trump told ABC News on Sunday he wants a say in who comes to power once the war is over; a new leader "is not going to last long" without his approval.