Do you not think that propaganda/information control is an important part of national security?
Given that Xitter is still a fairly widely-used social network platform, and Grok is supposed to be a major part of its defense against misinformation, including misinformation about things like domestic elections and corruption, I would say that it very reasonably qualifies as such. (Granted, to a large extent that horse has left the barn—but that doesn't mean we should just burn down the barn.)
Grok is run by a US company and can be regulated, so if the system prompt of the twitter bot version of Grok is important to national security it's easily within reach of legislators. Given our general stance on propaganda and manipulating public via media, news as entertainment not delivery of facts, etc, they probably won't though.
And to me that's a completely different concern than trying to limit another country's access to hardware for training large models, for example.
Given that Xitter is still a fairly widely-used social network platform, and Grok is supposed to be a major part of its defense against misinformation, including misinformation about things like domestic elections and corruption, I would say that it very reasonably qualifies as such. (Granted, to a large extent that horse has left the barn—but that doesn't mean we should just burn down the barn.)