knowledge, no. the bombshell turned out to be a dud. finally there's a man who replaced yovanovitch, acting diplomat bill taylor. >> bill taylor is the witness we are told the white house fears. because he tells a very clear story of what he saw as a shakedown, un-american shakedown of ukraine to get an investigation of the bidens. >> laura: swing and a miss. his closed-door testimony contained this inconvenient fact, congressman ratcliff says based on your knowledge no one in the ukrainian government became aware of a hold on military aid until august 29th. ambassador taylor responded that's my understanding. that means ukraine had no idea there was a hold on military aid