Here is LBJ on the phone explaining to Russell what he told Earl Warren:
https://discoverlbj.org/item/tel-00185
Thanks a bunch! I just listened to it and did hear LBJ saying what Hoover told him about the shooter and the rifle. Seemed that LBJ wasn't familiar with firearms. Also heard LBJ express concerns about 40 million dead Americans in an hour over if word that Moscow was behind the assassination gets out.
Thanks! I just finished listening to it. Seems to indicate LBJ did not want the public to believe Moscow was behind the assassination whether true or not.