On Friday, the New York Times reported that “in the days after President Trump fired James B. Comey as F.B.I. director, law enforcement officials became so concerned by the president’s behavior that they began investigating whether he had been working on behalf of Russia against American interests.” That investigation may well be continuing under the auspices of special counsel Robert S. Mueller III. We don’t know what Mueller has learned. But we can look at the key, publicly available evidence that both supports and undercuts this explosive allegation.