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A quiet but consequential shift inside Iran’s ruling establishment has propelled Mojtaba Khamenei into the role of supreme leader, marking a pivotal moment for the Islamic Republic and raising fresh questions about the nation’s political trajectory.

Analysts and observers say the ascension of Iran's Supreme Leader Mojtaba Khamenei could reshape power dynamics inside Tehran’s ruling circles, potentially strengthening the grip of the country’s powerful security institutions.

Kasra Aarabi, director of Islamic Revolutionary Guard Corps research at United Against Nuclear Iran, offered a striking comparison while speaking to Fox News Digital.

“Think of Mojtaba Khamenei as his father on steroids,” Aarabi said, suggesting the younger cleric may wield authority even more aggressively than his predecessor.

The Shadow Structure Behind the Throne

For years, Aarabi said, Mojtaba operated quietly but decisively inside the Bayt-e Rahbari, the powerful office of his father, Ali Khamenei, which serves as the core command center of the Islamic Republic.

“He was effectively functioning as a mini supreme leader,” Aarabi explained, describing how the office evolved into a complex power structure designed to maintain regime continuity if the elder Khamenei were removed from the political stage.

According to Aarabi, the intricate network built within the Bayt now ensures that power remains firmly within the same inner circle.

“His father created this apparatus precisely to safeguard the regime,” Aarabi said. “Through Mojtaba’s appointment, that continuity is exactly what we are witnessing.”

Trump Reacts to Leadership Transition

The leadership change also drew a reaction from Donald Trump, who spoke about the development in an interview with the New York Post.

Trump said he was dissatisfied with Mojtaba replacing his father as head of Iran’s theocratic government but declined to reveal what steps the United States might consider in response.

“Not going to tell you,” Trump said when pressed about possible plans regarding the new Iranian leader. “Not going to tell you. I’m not happy with him.”

Reform Hopes Fade

An Iranian source familiar with the leadership transition told Fox News Digital that earlier speculation about potential reforms under Mojtaba now appears unlikely.

In previous years, some observers quietly speculated that if Mojtaba took power, he might attempt limited political openings or a more pragmatic approach to foreign relations.

Those expectations have largely evaporated.

“Previously there were whispers suggesting that if Mojtaba were to become the leader, he might introduce reforms that would both open up the domestic political space and bring a more interactive approach to foreign policy,” the source said.

“However, now this possibility seems very weak.”

The source added that Mojtaba’s selection came amid internal disputes and heavy pressure from the Islamic Revolutionary Guard Corps (IRGC).

Because of that backing, the source said, Mojtaba now owes much of his political survival to the powerful security force — making it unlikely he will challenge its influence.