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Republican presidential candidate Donald Trump speaks during a campaign rally at the Orange County Fair and Event Center, April 28, 2016, in Costa Mesa, California.
Trump is vying for votes in the June 7 California primary election in hope of narrowing the gap to the 1,237 delegates needed to win the Republican presidential nomination. / AFP / DAVID MCNEW        (Photo credit should read DAVID MCNEW/AFP/Getty Images)
Republican presidential candidate Donald Trump speaks during a campaign rally at the Orange County Fair and Event Center, April 28, 2016, in Costa Mesa, California.
Trump is vying for votes in the June 7 California primary election in hope of narrowing the gap to the 1,237 delegates needed to win the Republican presidential nomination. / AFP / DAVID MCNEW        (Photo credit should read DAVID MCNEW/AFP/Getty Images)

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    RNC: Donald Trump presumptive GOP nominee

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RNC: Donald Trump presumptive GOP nominee

The Republican National Committee said via Twitter that they expect Donald Trump to be the Republican nominee. CNN's Mark Preston reports.

RNC: Donald Trump presumptive GOP nominee

The Republican National Committee said via Twitter that they expect Donald Trump to be the Republican nominee. CNN's Mark Preston reports.