Trump could just release all the emails internal to his campaign, transition, administration, and business. He could hand over all documents, computers, and personal communication devices. He could also release all bank records and tax returns relevant to the campaign, transition, administration, and business.
That would clear the matter up definitively in short order.
I wonder why he hasn’t released this material to the public yet.
A full and thorough accounting will surely clear him of any wrong doing and make the baseless accusations go away if it is all the witch-hunt trump claims.