President Donald Trump on Sunday warned Iran of consequences "the likes of which few throughout history have ever suffered," if it threatens the United States. "Never, ever threaten the United States again or you will suffer consequences the likes of which few throughout history have ever suffered before,” he said on Twitter in a direct message to Iranian President Hassan Rouhani. "We are no longer a country that will stand for your demented words of violence and death. Be cautious!” Trump said, writing the entire message in capital letters. Trump’s warning came after Rouhani earlier launched a rhetorical assault on the US over Iranian oil exports, telling the US president that “a war with Iran would be the mother of all wars." Rouhani’s comments came during a speech delivered in front of diplomats in the Iranian capital. In reference to the Strait of Hormuz, the Iranian President said: "We have always guaranteed the security of this strait. Do not play with the lions tail; you will regret it forever." Rouhani accused the US administration of seeking to overthrow the regime and divide Iran by imposing sanctions and economic pressure on it. "Whenever Europe has sought an agreement with us, the White House has sown discord," Rouhani said. "Americans should know that peace with Iran is the mother of all peace. Likewise a war would be the mother of all wars." Separately, Reuters on Sunday quoted US officials as saying that the Trump administration “has launched an offensive of speeches and online communications meant to foment unrest and help pressure Iran to end its nuclear program and its support of militant groups.” More than half a dozen current and former officials said the campaign, supported by Secretary of State Mike Pompeo and national security adviser John Bolton, is meant to work in concert with Trump’s push to economically throttle Iran by re-imposing tough sanctions. In response to questions from Reuters, a State Department official said, “Let me be clear, we are not seeking regime change. We are seeking changes in the Iranian government’s behavior.”