Senator Ted Cruz has just promised that if he becomes President of the United States he will do all he can to bring about the death of the current Head of State of the Islamic Republic of Iran, its Vilayat-el-faqih, or "Supreme Jurisprudent," Ali Khameini. It is true that he was not popularly elected, in contrast to Iran's President, Mahmoud Rouhani, but he is indeed the Commander-in-Chief of its military, which is what is crucial for the matter of nuclear weapons policy, which, presumably, is why Cruz wants to off him.
Apparently Cruz is unaware of the fact that after Iran halted its nuclear weapons program after the US invaded Iraq over a decade ago, Khameini issued fatwas against nuclear weapons, which are still in place. As it is, if Cruz is aware of this, he probably believes that Khameini was lying when he issued those fatwas, even though official US National Intelligence Estimates supported by all 17 publicly known US intelligence agencies have agreed that Iran has not had an active nuclear weapons program since 2003.
Frankly, at this point in time, Senator Cruz looks like a much bigger threat to world peace than does the Ayatollah Khameini.