Javad Zarif tweeted: "COLOR US UNIMPRESSED: The world heard even harsher bluster a few months ago; and Iranians have heard them —albeit more civilized ones—for 40 years. We've been around for millennia & seen fall of empires, including our own, which lasted more than the life of some countries. BE CAUTIOUS!"
The US president warned the Islamic Republic of consequences never seen before. And he says he is not concerned that he may be heightening tension. Al Jazeera's Shihab Rattansi reports from Washington, DC
