People reassured about Iran’s lack of nuke delivery systems are delusional. A few even primitive nukes in cargo ships in the ports of New York, Louisiana and Long Beach would do unimaginable damage.
Yes, and unless the military can scan and prevent entry by reading a nuclear signature by satelite we are screwed.
As far as terrorists with nukes; all it takes is money to buy one and there are many nuclear nations that would sell them one destined for the USA.