This is double speak. The rules of the party SAY that the rules can be rewritten by the rules committee anytime they want.
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For the NATIONAL CONVENTION, not the State processes, each state determines their own process. It has been this way for many years prior to precious whiner trump getting involved.
Oh well that’s better. The states can do what ever they want and then at the national convention the rules committee can do anything they want with the states results. Sounds pretty logical to me...