You address all living presidents as Mr. President. Doesn't matter if it's Carter popping in for an interview, he's addressed as Mr. President. Yes, even obama. Even Bill Maher addresses Bush as Mr. President in his open-letter-style rants.
Referring to Trump as former president trump is also correct, but you don't have to say that unless you're pushing a narrative.
Also, Q is and always has been fake and gay.
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