There are so many pundits saying "Oh no, don't give up on live oral questioning!" That ignores the inevitable Trump defense, which Kavanaugh just proved works...
Trump defense to lying: "It was live questioning, it was stressful, and I've been lying out loud for crying out loud for 3 years, what did you expect?"
That defense is eliminated when Mueller goes to written questions and written answers with lawyers' help.
Mueller is still insisting on follow-up questions, too.
I think Mueller has evidence of Trump’s Russian conspiracy in June 2016 (from Manafort) and Nov-Dec 16 (from Flynn) plus more from Cohen.
Mueller is taking written answers b/c he already has the goods.
Lying on a written answer is far more damaging...