This is quite the insightful statement on multiple levels. First, because this isn't a trial, so your use of the word "defense" is inaccurate in that sense (but Freudianly on the mark in terms of Trump and his supporters being on the defensive). Second, because it undercuts the popular talking point that Republicans have trotted out in which they claim that various witnesses are only testifying because they want attention. And third, because it reinforces the belief that the Republican strategy has less to do with facts, and more to do with being a star on TV.
This is the kind of "looking to jump on anything and turn it to something it's not" we could do without.
I'm guessing it's not the correct legal term, but "defense" is pretty clear what he meant when one side is accusing or considering accusing another. He said she was a helpful witness to that side. If you disagree with his statement and don't think she's been a good witness, say why. Not everything has to be twisted into a point for your side.