If Trump gets to 1,237 delegates, he will be the Republican nominee.
Romney September 2015 Aspen Institute
Question: Will you support Donald Trump if he's the nominee in the end?
Romney: I will support the nominee...
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Romney October 2015 CNN State of the Union-
Jake Tapper: You would vote for Donald Trump over Hillary Clinton, right?
Mitt Romney: I would vote for the nominee of the Republican Party, but I don't think that's going to be Donald Trump