Donald Trump has won the Republican presidential primary in California, the biggest prize in his triumphant run to become the GOP nominee.
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Trump will now go on to the national convention in July with more than enough delegates to become the official nominee, but his candidacy remains a source of controversy, with many in the GOP struggling to rally behind the brash billionaire.
Earlier Tuesday, House Speaker Paul Ryan said that comments Trump made accusing a district court judge of passing a racially-motivated judgment against him were the "textbook definition of a racist comment," and Sen. Mark Kirk of Illinois withdrew his support from the presumptive nominee.
