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At the Republican Convention, a candidate must have a majority of delegates from 8 or more contests in order for their name to be put into nomination.
There was a lot of speculation, including by myself, that Trump may have been the only candidate who would have qualified to be nominated.
The rule was designed after Ron Paul took over 10% of the delegates in 2012 and embarrassed Romney who was nominated by less than 90% of the delegate total.