Gigot would have us believe the  If Starr rises, Clinton falls; but if Starr falls, Clinton doesn't rise.
It is not true that Starr goes up when Clinton goes down.  
mnli hypothesis: It is not true that Starr goes up when Clinton goes down.   premise: Gigot would have us believe the  If Starr rises, Clinton falls; but if Starr falls, Clinton doesn't rise.