The best point he lays out is how there should have never been a special counsel appointed. If there was truly a conflict within the DOJ to handle the case, then why are there top DOJ officials working on Mueller's team? There would still be a conflict of interest.
https://www.washingtontimes.com/news/2018/sep/7/cory-booker-gets-george-costanza-bad-boy-lampoonin/