U.S. President Donald Trump has said that Iran’s newly appointed supreme leader will not remain in power for long without his approval. Speaking to ABC News, Trump stated that the new leader must seek authorization from the United States, otherwise his leadership will not endure.

Iran has announced Mojtaba Khamenei, the second son of the late Ayatollah Ali Khamenei, as the country’s new supreme leader. The decision was made by the 88-member Assembly of Experts, which elects the supreme leader. The assembly also called on citizens to support the new leader following the announcement.

Ayatollah Ali Khamenei was killed on February 28 in a joint U.S.-Israeli strike that also claimed the lives of his wife, daughter, and several senior military officials, according to Iranian state media reports.