An anti-Donald Trump protester waves a Mexican flag outside the California Republican Party 2016 Convention on April 29 in Burlingame, Calif. (Associated Press)
New Jersey Gov. Chris Christie pauses as he addresses delegates at the California Republican Party Spring 2015 Organizing Convention in Sacramento, Calif., Saturday, Feb. 28, 2015, Christie told the crowd of about 500 lunch guests that the party should not rush into choosing a 2016 presidential nominee because of pressure from pundits and donors.(AP Photo/Rich Pedroncelli)
FILE - In this March 15, 2014 file photo, former Secretary of State Condoleezza Rice speaks at the California Republican Party 2014 Spring Convention in Burlingame, Calif. From Rice to the head of the International Monetary Fund and the former chancellor of the University of California, Berkeley, the list of 2014 commencement speakers backing out following student and faculty protests continues to grow. (AP Photo/Ben Margot, File)
Former Secretary of State Condoleezza Rice gestures while speaking before the California Republican Party 2014 Spring Convention Saturday, March 15, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari walks in the exhibitors area at the California Republican Party 2014 Spring Convention Saturday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari speaks with his campaign workers at the California Republican Party 2014 Spring Convention Saturday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari, second from left, speaks with reporters at the California Republican Party 2014 Spring Convention Saturday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari displays a campaign video posted to Instagram at the California Republican Party 2014 Spring Convention Saturday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Former Secretary of State Condoleezza Rice gestures while speaking before the California Republican Party 2014 Spring Convention Saturday, March 15, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari speaks to supporters at the California Republican Party 2014 Spring Convention, Friday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari speaks to supporters at the California Republican Party 2014 Spring Convention Friday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Neel Kashkari gestures while speaking to supporters at the California Republican Party 2014 Spring Convention Friday, March 14, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Tim Donnelly, right, embraces his son, Daniel, at the California Republican Party 2014 Spring Convention in Burlingame, Calif. on Saturday, March 15, 2014. California Republicans are gathering in the San Francisco Bay Area to plan the future of the party in a state where their registration and influence have been sliding. (AP Photo/Ben Margot)
Gubernatorial candidate Tim Donnelly speaks with a supporter at the California Republican Party 2014 Spring Convention in Burlingame, Calif. on Saturday, March 15, 2014. California Republicans are gathering in the San Francisco Bay Area to plan the future of the party in a state where their registration and influence have been sliding. (AP Photo/Ben Margot)
Gubernatorial candidate Tim Donnelly meets with a supporter at the California Republican Party 2014 Spring Convention Saturday, March 15, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)
Gubernatorial candidate Tim Donnelly, center, gestures while speaking with reporters at the California Republican Party 2014 Spring Convention Saturday, March 15, 2014, in Burlingame, Calif. (AP Photo/Ben Margot)