Comey and Rogers said over and over again that Russia's pawprints were all over this.

You just claimed that the NSA was involved in this alleged "surveillance " of Trump (quite a stretch from his original claim, btw).  And yet the head of the NSA denies any knowledge of any surveillance.  But maybe some other agency head knew about it, and Trump would have found out how, exactly.  Remember what Rogers said was done with the identities of Americans recorded unintentionally - if the conversation gave no hint of criminal activity, their identity and the conversation is purged.  If something warrants investigation, the name is masked with a generic identifier.  The only way that someone could have tied the alleged conversation to Trump would be if it had been retained as evidence of criminal activity.  And if it really were true, then the existence of the tap would still be classified information, and Trump committed a felony by revealing it.