In an attempt to make John's Gospel sound like the pinnacle of so-called "anti-semitic" portrayals of Jewish responsibility for Jesus' death, Bart Ehrman makes the false statement that the chief priests carry out the crucifixion in John.
Here is the audio in which he discusses his development theory, beginning around minute 17:
https://www.premier.plus/unbelievable/podcasts/episodes/ehrman-vs-mcgrew-round-2-do-undesigned-coincidences-confirm-the-gospels
The Lydia McGrew Podcast