Stumbling over the word collusion for 13 seconds is the first clue.
"The word is 'conspiracy.'" "Thank you, Congressman."
Hey it happens to me occasionally, but not like that. I think he's in the early stages of some form of dementia. He can be pretty cogent on stuff that's in his "hard drive," either through intense preparation or long ago memory. But, he clearly couldn't cram by getting up on his own group's report.