This is interesting rhetoric on the part of the Iranian regime.
They've been publicly threatening the US even in the absence of any threats on the part of the US.
My suspicion is that they're trying to goad the US into attacking Iran, in the hope that this will unite its population behind the government the way it did last time.
https://apnews.com/article/iran-protests-trump-revolutionary-guard-059ba55b8e169d57f978fc3c52ccd05a