Donald Trump said Thursday that Mojtaba was “unacceptable,” and Israel has vowed to target any declared successor to Khamenei.

A statement from the Assembly of Experts — the panel of Shiite clerics responsible under Iranian law for choosing the country’s top leader — said Mojtaba Khamenei had been selected as the third leader of the Islamic Republic, according to reports from IRIB state TV and the Fars, Tasnim and ISNA news agencies.

President Donald Trump told Axios last week the choice would be “unacceptable” and suggested he wanted to hand-pick a new supreme leader, a process usually overseen by Iran’s clerics.

“They are wasting their time. Khamenei’s son is a lightweight. I have to be involved in the appointment," he said. “Khamenei’s son is unacceptable to me.”