Andrew McCarthy of National Review Online emphasizes a different element of special counsel Robert Mueller’s investigation of Russian interference in American electoral politics.

Mueller has been at this for six months, and the FBI for a year before that. So isn’t it about time we asked: Could Mueller prove that Russia did it?

Forget Trump. What about Russia?

We have paid too much attention to the so-called collusion component of the probe — speculation about Trump-campaign coordination in Russia’s perfidy. There appears to be no proof of that sort of collusion. Because it has been our focus, though, Mueller has gotten a free pass on a defect that would be fatal to any related prosecution theory: He cannot prove beyond a reasonable doubt that Russia is guilty of hacking the Democratic National Committee and prominent Democrats.

This doesn’t mean it didn’t happen — like the U.S. intelligence agencies, I’m assuming it did, and that Russia should continue to be the subject of intense government counterintelligence efforts. The point is that Mueller can’t prove it in court, which is the only thing for which a prosecutor is needed. If he can’t establish to the required standard of proof that Russia conducted an espionage attack on the election, it is impossible to prove that anyone conspired with Russia to do so. There is no criminal case.