Pres Trump as presumptive nominee is the leader of the party.
He must be a Zeeper/foreign agent as well?
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Hardly, but the 45th President has to deal with the reality, that Republican politicians & voters are divided on continuing the funding for the Russian Ukraine War.
Trump wants a 2nd term and his policy positions run the gamut for Republican voters.
That reality being the expected value of supporting Johnson.
Either one trusts Pres Trump or not.