Consortium News has published A Demand for Russian ‘Hacking’ Proof,

More than 20 U.S. intelligence, military and diplomatic veterans are calling on President Obama to release the evidence backing up allegations that Russia aided the Trump campaign – or admit that the proof is lacking.
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Alleged Russian interference has been labeled “an act of war” and Mr. Trump a “traitor.” But the “intelligence” served up to support those charges does not pass the smell test. Your press conference on Wednesday will give you a chance to respond more persuasively to NBC’s Peter Alexander’s challenge at the last one (on Dec. 16) “to show the proof [and], as they say, put your money where your mouth is and declassify some of the intelligence. …”

Obama doesn’t have to reveal sources and methods. All he has to do is respond to this non-clasified report by civilian computer security experts. as indicated in my previous post US Govt Data Shows “Russia” Used Outdated Ukrainian PHP Malware.