The New York Times noted: "Trump's message was apparently in response to a speech on Sunday by Mr. Rouhani, who warned the United States that any conflict with Iran would be the 'mother of all wars'".
President Donald Trump's searing ALL CAPS response to a relatively routine Iran provocation is the latest example of Trump's refusal to show weakness, continuing a pattern that includes showdowns with North Korea, China and even NATO allies, with Russian Federation the notable exception.
Iran's people want to be free from a corrupt government and also wish for closer ties with the United States, says a USA senator.
Trump in May withdrew the U.S. from the Iran nuclear deal, which eased sanctions on Iran in exchange for restraints on its nuclear weapons program.
US President Donald Trump's recent anti-Tehran comments are the "words of a troublemaker" pursuing "ignorant diplomacy", Iranian officials have declared, as the angry exchanges between Iran and the US rapidly escalate.
Iranian leaders have also made threats about the possibility of the United States blocking its oil exports, a key source of revenue for Iran.
But despite repeatedly warning that Obama would get us stuck in a war with Iran, Trump as president has repeatedly rattled his own saber.
He cited the harsh words between the U.S. and North Korea that preceded the high profile summit between Trump and North Korean leader Kim Jong Un and denuclearization talks.
He said that "threats of military force are never helpful, and I think that particularly in the tense situation in the Middle East this is not a helpful means of discourse". But the White House blamed Rouhani for inciting the war of words with his comment that "America must understand well that peace with Iran is the mother of all peace and war with Iran is the mother of all wars".
Later Monday morning, national security adviser John Bolton said Trump told him that "if Iran does anything at all to the negative, they will pay a price like few countries have ever paid before". White House press secretary Sarah Sanders declines to say whether Trump had consulted with national security aides, but said "The president consults with his national security team on a daily basis".
The other signatories to the deal, including France, the United Kingdom and Germany, have vowed to stand by it.
While Trump's "tough stand" was hailed by Israeli Prime Minister Benjamin Netanyahu, it also provoked an avalanche of questions about its exact meaning and impact.
Both the tweet and the speech landed less than two weeks before the administration will begin re-imposing sanctions on Iran that had been lifted under the 2015 nuclear deal.
The Iranian rial plunged to a record low against the US dollar on the unofficial market on Monday amid fears of military confrontation between Iran and the United States.
Washington initially planned to shut Iran out of global oil markets completely after Trump abandoned the deal that limited Iran's nuclear ambitions, demanding all other countries stop buying Iranian crude by November. This response reflects a long-held Iranian view that Republicans are easier to deal with than Democrats, less beholden to such inconvenient ideas as human rights, and more attuned to the needs of the oil industry.
"Right now, the United States is undertaking a diplomatic and financial pressure campaign to cut off the funds that the regime uses to enrich itself and support death and destruction", Pompeo said Sunday.