How do you know what's already here? Who says it would be a nuke? Or just one of anything. And keep in mind the NY Times blew it on the NSA listening thing. THAT was working. (the a$$hole$)
I don't know what's already here. In response to the very good point above: "Why spend $7 billion to blow up something that you can easily do for free?", you stated: "If they can get it into the port, they can get it out. So they wouldn't blowup the port." My point is the same - anything from nuke on down they sneak THROUGH the port risks not just their $7 billion investment but also their own country - what is so hard to understand?