It may be hard to believe, but the NSA intercepts and stores every electronic communication. All Trump has to do is to have newly appointed acting Pentagon chief Miller order Gen. Nakasone to release materials spelling out chapter and verse on the Russiagate operations orchestrated by Brennan, Comey, and ex-National Intelligence Director James Clapper. Nakasone reports to the secretary of defense.
Don’t be misled; virtually all of it can be released with ZERO danger to intelligence “sources and methods.” But release won’t happen if Trump continues to just whine to Fox News, or he “authorizes” release without follow-up (he’s already done that — to no effect).