Some Clinton aides suspect that Roger Stone, an on-again, off-again adviser to Trump, counselled WikiLeaks on the optimal timing for its disclosures. Six days before the leaks began, Stone tweeted, “@HillaryClinton is done. #Wikileaks.” Stone said that he was “flattered” by the suspicion but denied that he had given the group advice. He said that he was merely alerted to the leaks by a “mutual friend” of his and Assange’s: “And I was told that the information he had would be devastating to Hillary. I was not told the subject matter.” Stone was among those named in news reports about evidence that Trump associates had had exchanges with Russian intelligence officials. According to Stone, he has not been contacted by the F.B.I., and such suspicions are unfounded. (“If they have evidence of a crime, indict somebody,” he said. “I have not been in touch with anybody in Russia. I’ve never been to Russia. I don’t know any Russians.”)