badger the witness

To mock, harass, or antagonize a witness for the opposing side in a trial. Objection, your honor! The prosecution is clearly badgering the witness. These questions serve no purpose other than to humiliate and discredit him before the jury. No, you can't say that on the stand, they'll think you're badgering the witness. I'm not badgering the witness, I'm simply asking a question!