NEW : LA Clippers Commissioner Shelly Sterling dismisses Donald Sterling 's accusation . NEW : Silver : NBA is stepping back amid dispute between Adam Silver , Adam Silver . LA Clippers co-owner Donald Sterling 's says he will no longer support the team 's sale . Donald Sterling 's lawyer says no court will believe his client is mentally incapacitated .
NEW : NBA Commissioner Adam Silver dismisses Donald Sterling 's accusation . NEW : Silver : NBA is stepping back amid dispute between Donald , Shelly Sterling . LA Clippers co-owner Donald Sterling says he will no longer support the team 's sale . Donald Sterling 's lawyer says no court will believe his client is mentally incapacitated .