GOP senator: Trump's judge comments 'literal definition' of racism
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Sen. Ben Sasse (R-Neb.) lashed out at Donald TrumpDonald John TrumpGOP senator introduces bill to hold online platforms liable for political bias Rubio responds to journalist who called it 'strange' to see him at Trump rally Rubio responds to journalist who called it 'strange' to see him at Trump rally MORE on Monday, calling the presumptive GOP presidential nominee's criticism of a California judge "the literal definition of 'racism.' " 

 
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Though the Nebraska Republican did not mention Trump by name, he's been a frequent critic of his party's presumptive nominee and has pledged to not support Trump in November. 
 
Trump said last week that U.S. District Judge Gonzalo Curiel has "an absolute conflict" of interest in presiding over Trump University lawsuits because of his "Mexican heritage." 
 
Trump has been a tough critic of illegal immigration from Mexico and has vowed to build a wall along the U.S.'s border with the country. "I'm building a wall. It's an inherent conflict of interest," he told The Wall Street Journal.
 
His comments have sparked fierce backlash from Democrats and many Republican lawmakers, who worry Trump has gone too far.
 
Senate Majority Leader Mitch McConnell (R-Ky.) disavowed Trump's attacks during an interview with NBC's "Meet the Press" on Sunday but stopped short of calling them racist. 
 
Republicans are defending 24 Senate seats in November, and McConnell is increasingly voicing concerns that Trump could turn Hispanic voters against the Republican Party.
 
Democrats need to pick up four seats to win back the Senate majority if they also retain the White House. They'll need to net five seats to win it outright.