A follow-up to this post by the Wolf. The same article mentions that:

Questioned about France's prewar offer to support the U.S.-led coalition if Iraq used chemical weapons, Powell said, "The fact is, if France wanted to help us, our troops are in just as much danger from high explosive rounds than they are from chemical rounds."
"So I'm not sure what the particular distinction is," he said dismissively on France 3 television.

Indeed, I don't think anyone is really sure, Mr. Secretary.