I have believed this since the beginning - KT McFarland: 'Russia Hoax' Devised to Cover Up 'Something Very Big'
I've thought that they were covering up something Russia-related with Hillary/Clintons. As we all know, they like to accuse you of what they do. It was definitely a big time misdirection tactic. Doesn't take anything credible for the media to play along. I still can't believe Susan Rice wasn't challenged even a little bit on at least one of the five talk shows she went on and spewed that ridiculous Youtube video story after the Benghazi attack.
I certainly don't rule out the possibility that Bammy was trying to sabotage the President for reasons other than just to ruin him and preserve his pathetic "legacy." But in terms of motivation, Occam's razor would apply:
Bammy tried to ruin Trump because he (rightly) feared Trump would ruin him.