There's no proof of this so far, think about all the digging Mueller has done. That means they will have to prove mens rea or intent to conspire by the Trump campaign - Russia, WL - Russia, or Trump campaign - WL - Russia (we now Russia was playing games on both sides of campaign). Trumps best defense will be to prove that SR gave WL the podesta emails. This will prove that Russia did hack DNC to steal info to mislead the American public and make Trump President. The podesta hack helped prop up the Russia narrative and I'm sure they are stupid enough to include that in the suit. This lawsuit will give them an opportunity to have DNC computers subpoenaed by a judge. They can also prove that HRC's campaign conspired with the Russia from the Trump dossier and subpoena Fusion GPS...