Mojtaba Khamenei is Iran's supreme leader. He is the son of the previous supreme leader.

His father was killed by the United States and Israel. Mojtaba Khamenei reportedly vowed revenge for his father's death.

President Trump warned against any attempt to assassinate him. Trump's warning came in response to the revenge vow.

Heavy clashes happened this week between the United States and Iran. These clashes came before the vow and Trump's warning.

Sources say both sides traded military strikes after signing a ceasefire deal. The strikes mark an escalation despite that agreement.