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SAN DIEGO, CA - MAY 27: Republican presidential candidate Donald Trump speaks at a rally in San Diego on May 27, 2016 in San Diego, California. Trump is on a Western campaign trip which saw stops in North Dakota and Montana yesterday and two more in California today. (Photo by Spencer Platt/Getty Images)

SAN DIEGO, CA - MAY 27:  Republican presidential candidate Donald Trump speaks at a rally in San Diego on May 27, 2016 in San Diego, California. Trump is on a Western campaign trip which saw stops in North Dakota and Montana yesterday and two more in California today.  (Photo by Spencer Platt/Getty Images)