Can I prove that he actually did agree to discourse with them? No. What I can prove is that he claimed (on video) to be support the hyde amendment which bans federal funding for most abortions, then totally flipped his position. Plus there are many articles talking about the letter I posted but even all the ones criticizing that letter don't point to any false claims, they just call the writers naive, which is very true. If anything, they simply became willfully ignorant of Biden's stance driven by strong orange man bad feelings.