The commander of the Iranian Navy is apparently claiming that the Iranian Navy will soon "have a powerful presence" near the United States. Other than the fact that it's very unlikely to happen -- they'd be lucky to limp into some Cuban harbor at the end of a 10 knot journey and lay over for several months of voyage repairs before trying to limp home -- the thought of them doing something like that would be a rude awakening to their crews if they did manage to hang around off our shores.
For those who haven't had the chance to participate during the few instances in the last couple decades when potential adversaries try to "show the flag" off our coast, we tend to drop the niceties we observe when conducting "freedom of navigation" exercises off Country Orange's shore and start playing at the varsity level. (I was the Sub Guy on the Stennis Battle Group Staff for the Oscar deployment mentioned in the link above.) If the Iranians think we're annoying when we follow all the rules of international maritime law when we're sailing through the SOH, just wait until they're the visiting team.
Since a "powerful presence" for them involves an oiler and a couple of 1400 ton frigates, I'm not too worried if they did end up following through with their "threat". Which they can't, not because they're not brave, but because their equipment isn't worth crap. (Unless you're a Congressional staffer trying to decide if you should tell your boss to vote for more money for the Navy to counter the Iranian threat -- in that case, they're a first-class Navy; Kilos get better with age!)