U.S. President Donald Trump has reignited a dispute with Pope Leo over Iran’s nuclear program and the reported number of deaths in the country’s anti-government protests. In a statement on his social media platform Truth Social, Trump declared that Iran possessing a nuclear bomb would be unacceptable. He criticized Pope Leo, claiming Iran had killed at least 42,000 unarmed protesters in the past two months and ended his message by asserting, “America is back.”

Two days earlier, Trump had accused Pope Leo of being weak on crime and disastrous in foreign policy. Pope Leo, the first American-born pontiff, had recently condemned U.S. and Israeli military operations in Iran and Lebanon. In response, he said he was not afraid of the Trump administration and would continue to speak against the horrors of war.

Trump’s claim of 42,000 protester deaths has been questioned. Iran’s government reported 3,117 deaths, while human rights groups estimated around 7,007. The UN’s special envoy to Iran suggested the toll could range between 5,000 and 20,000. The International Atomic Energy Agency stated it has no evidence that Iran is developing nuclear weapons.