Iran responds:
"COLOR US UNIMPRESSED: The world heard even harsher bluster a few months ago. And Iranians have heard them —albeit more civilized ones—for 40 yrs. We’ve been around for millennia & seen fall of empires, incl our own, which lasted more than the life of some countries. BE CAUTIOUS!"
http://twitter.com/JZarif?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor
For context, the Persians/Iranians invented the postal service, defeated (rich as) Croesus, fought Alexander the Great, enslaved the Roman Emperor Valerian and were defeated by Genghis Khan.
Trump is a nobody in the span of Persian history. America is a pipsqueak.