Original sentence: Some Republicans dismiss that allegation and claim an opponent of Bush, possibly Bill Burkett who admits to bringing the documents to CBS, falsified the documents.Some defenders of Dan Rather and CBS, including a member of Congress, have alleged that Republicans, possibly Karl Rove and/or Roger Stone, preempted the controversy over President Bush's service record in the Texas Air National Guard by creating and supplying the false Killian documents used in the 60 Minutes report in order to discredit a potentially legitimate source of criticism.The origin of the documents prior to Bill Burkett and CBS is disputed
Edited sentence: Some Republicans dismiss that allegation as being groundless and suggest that an opponent of Bush, possibly Bill Burkett who admits to bringing the documents to CBS, falsified the documents.Some defenders of Dan Rather and CBS, including a member of Congress, have alleged that Republicans, possibly Karl Rove and/or Roger Stone, preempted potential controversy regarding President Bush's service record in the Texas Air National Guard by supplying the false Killian documents used in the 60 Minutes report - so as to discredit a potentially legitimate source of criticism.The origin of the documents prior to Bill Burkett and CBS, as well as the provenance of their actual form (photocopies), is not substantiated and is disputed