No he didn’t.
No, not yet. Did you read the article? Switching parties is his nuclear threat if dems don't come through on their promises to him in order to secure his vote for this boondoggle.
I watched his interview. He said no such thing.
He wouldn't say it in the interview, it would have been in a private negotiation with Snake Schumer about the deal, IF he actually said it. Pundits speculate with the evidence they have to make sense of it. So I agree with you that he didn't say it in the public interview, but switching parties appears to be the only powerful retaliation Manchin has if Schumer gets Manchin's vote now but fails to follow through on those promises.
"Did Joe Manchin Threaten to Switch Political Parties?" Chuck Todd Seems to Know He Did
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