No primary, caucus, or convention to elect, select, allocate, or bind delegates to the national convention shall occur prior to the first Tuesday in March in the year in which a national convention is held. Except Iowa, New Hampshire, South Carolina, and Nevada may begin their processes at any time on or after February 1 in the year in which a national convention is held and shall not be subject to the provisions of paragraph (b)(2) of this rule.
RNC Rule 15(b)(1)
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