Yeah, I omitted High Treason, because it obviously doesn't apply.
And the laws sound treason are pretty much entirely focused on facilitating a foreign military invasion. Based on what we know so far, I don't think there's anything there that would hold up in court.
But like I said the last time this came up, by all means, investigate away. I just think it's far more likely that they'd get nailed on lesser charges like foreign interference-related stuff (but I don't really know anything about our foreign interference laws, save that they seem to be woefully inadequate).