Nukes on U.S. soil?

There is a new book, sporting an old theme, authored by Yossef Bodansky. It is titled Chechen Jihad: Al Qaeda’s Training Ground and the Next Wave of Terror. The main argument of the book may be summarized as follows: Al Qaeda has nuclear weapons, and some of these have probably been smuggled into the United States for use against American cities. The weapons are Soviet-made weapons, smuggled out of Russia courtesy of the Chechen mafia via the Chechen rebel state (i.e., “Al Qaeda’s Training Ground”). It is an old story, first told by Bodansky in 1999 and repeated in greater detail in this more recent volume.

How outlandish is this argument? If such devices are man-portable, our borders are certainly no obstacle.

"Strategic Relationships." By J.R. Nyquist, Financial Sense Online, 3/18/08.

H/t "American Ideological Society."