Senate Majority Leader Reid says Senate went past years ' without paying taxes . Democratic push back against Reid 's unsubstantiated claims , calling him a liar . CNN 's Ashley Killough contributed to this report . Senate sources say they know they 're playing into Graham 's hands by responding but feel they must . Reid often pulls no punches when going after an opponent , especially one he dislikes .
Senate Majority Leader Reid says Senate went past years ' without paying taxes . Democratic push back against Reid 's unsubstantiated claims , calling him a liar . Senate sources say they know they 're playing into Graham 's hands by responding but feel they must . Reid often pulls no punches when going after an opponent , especially one he dislikes .