ComChina would be a good supplier of fresh suitcase nukes. I would say China has the tech. to make them. Making on time delivery as needed. China brings suitcase into the USA via CosCo or some other ChiCom controlled entity.
A Bin Laden cell picks up the nuke and uses it at the right time and place.
Uh-huh. And when spectrographic analysis of the fallout reveals that it was made in China (easily done, when you consider that China has had a BUNCH of atmospheric tests for us to take fallout samples from), the resulting US retaliation destroys China as any sort of viable nation-state.
And the Chinese KNOW this. They aren't stupid.