treatment in the hou-- impeachm house and said abuse of power is difficult to prove alone. abuse of power has never been the sole basis for a presidential impeachment and was not proven in this case. >> mr. chief justice, senators, thank you for that question, and that is exactly correct. professor tur will yley was ver critical of the entire process in the house and of the charges that the house -- house democrats were considering here, both the abuse of power charge and the obstruction charge, and he explained that this was a rushed process. they had not adequately pursued an investigation, that as the senators point out in the question, abuse of power is an exceedingly difficult theory to use to impeach a president, and it has never been used without