Seems to me that saying that this is a national security issue is admitting that (at least some of) the emails are classified, which up to now has been vehemently denied by the Clinton camp.

Thank you AxDh. Also, just the fact that Musk was able to break into the US car manufacturing market at all (look at the previous failed attempts by thousands, leaving just the Big 3 and very few others) makes Tesla a very special snowflake, indeed.