He did something "wrong" in the eyes of the cabal.
He was becoming too popular of a figurehead, and risked unbalancing the uncontrolled masses. (They have someone in mind to take that role, can't have one of the peons getting too much support or their will be an ideological clash on their side).
[less likely] He really was becoming a liability for them and they couldn't keep this information under wraps much longer.
Either:
Kamala sees him as a threat to her running in 2024. She is the establishment candidate and is using her current influence to take out rivals.
The woman who got where she is by sucking dick and having a skin tone that might fool idiots into thinking she's black. President. Oh, dear Lord.
I think this is the answer.
There's nobody I think would be more likely to actually do what I predict will happen in the next few years than Kamala Harris.