Should someone point out there is no such thing as a "suitcase" nuke?
Actually there is, its a derivative of the
W54 nuclear warhead (which was very old 1950s technology). The possibility of hand held grenade sized nuclear demolition charges with yields up to 10-50 tonnes are thought to be possible using modern design technology.
http://youtube.com/watch?v=Pf6uX0hODuE