Iranian leader Ayatollah Ali Khamenei expressed doubt about his country's nuclear negotiations with the United States, saying he does not think the talks will come to a result, according to the official Islamic Republic News Agency.

Iran’s supreme leader has pushed back against U.S. criticism of the country’s nuclear program. Ayatollah Ali Khamenei said Tuesday that Tehran won’t seek permission from anyone to enrich uranium and called American statements “nonsense.

Iran’s Supreme Leader Ayatollah Ali Khamenei said he does not expect negotiations with the United States over Tehran’s nuclear program to “reach a conclusion” as Washington toughens its conditions for a deal.