I am not a lawyer. Lawyers tell me that I cannot ask this. Citizenship is not a requirement for the job, having export license is. Obtaining it is correlated with being a national of certain countries and not being a national of other countries. Having a US citizenship, however, is a very high probability of success.
I'm not a lawyer, or involved in hiring, but I do work on an export controlled product. The training I recieved says that one form of "exporting" is conveying technical information to a non-citizen. The only reason export controls prevented us from from showing the material to an arbitrary citizen was our liability if they exported it.
