This 20 nuke scenario certainly begs some questions. What's the smallest number of people required to hide 20 suitcase nukes in perfect secrecy over several years with the necessary skills to maintain the technology and distribute them to 20 different locations? It seems the more people involved the more difficult it becomes to keep this secret. And yet supposedly the author knows. And if AQ can breach our country with WMDs wouldn't it suggest they have already breached other countries like England, France, Spain, Italy, Russia with similar weapons? For whatever border problems we have here, I don't believe these other countries have better security than we do.
Europe no longer has border security. Its all open now. You can roam across border after border after border and not have to encounter any check points.
Fifth column in our military?
One would do if he made several trips to the border. Larger numbers would be a risk. Of course, one might kill the delivery boys in order to maintain security. One guy could visit the storage sites on a rotating basis in order to perform routine maintenence.