Donald Trump Holds Campaign Rally In Las Vegas, Day Ahead Of State's GOP Caucus [Getty Images]

LAS VEGAS, NV - FEBRUARY 22: Republican presidential candidate Donald Trump speaks at a rally at the South Point Hotel & Casino on February 22, 2016 in Las Vegas, Nevada. Trump is campaigning in Nevada for the Republican presidential nomination ahead of the state's February 23 Republican caucuses. (Photo by Ethan Miller/Getty Images)

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