The Iranians can't hit DC, and seriously, screw Tel Aviv.
But let's get real here. According to Bibi, Iran has been "Weeks away from getting the bomb" for 30 years.
I don't think even he believes that shit, but you apparently do.
But let's say, for the sake of argument, Iran gets a bomb. It would probably be a primitive fission bomb like the one we dropped on Hiroshima, and not the kind of Fusion bombs we all have aimed at each other today.
Do you really think they are so suicidal that they'd risk having Israel and the US nuke their cities with much bigger bombs for the limited satisfaction of wiping Tel Aviv off the map? (which would have serious consequences just in terms of nuclear fallout).