JD Vance, who chose St Augustine as his patron saint upon converting to Catholicism, criticized Pope Leo XIV's stance on the Iran war during a Turning Point USA event. Vance referenced just war theory, rooted in St Augustine's teachings, to defend military action. Meanwhile, Pope Leo XIV was in Algeria, honoring St Augustine's legacy. The pope has faced criticism from Trump, who accused him of being weak on foreign policy. The just war doctrine emphasizes strict conditions for military force, aiming to prevent unjust wars. Experts argue that the pope's position is consistent with Church teachings, and the ongoing debate reflects broader tensions within American Christianity.