Former Sgt . The former sergeant was convicted of the murder in June last year and sentenced to life with a minimum term of 15 years. Claims the Chairman of the Joint Chiefs told him this during private question and answer session . Ex-White House aides have said it is inconceivable that President Obama did not know . Bergdahl is charged with desertion and misbehavior before the enemy .
Former Sgt . Matt Vierkant claims Admiral Mike Mullen knew Bergdhal deserted . Claims the Chairman of the Joint Chiefs told him this during private question and answer session . Ex-White House aides have said it is inconceivable that President Obama did not know . Bergdahl is charged with desertion and misbehavior before the enemy .