http://www.huffingtonpost.com/entry/gop-senators-donald-trump_us_57571fcfe4b0b60682df2e27
"Sen. Mark Kirk (R-Ill.) became the first Republican member of Congress to rescind an endorsement of Donald Trump, saying on Tuesday that he could no longer support his party’s presumptive nominee for president after Trump’s racist attacks against a federal judge. “I cannot and will not support my party’s nominee for President,” he said. Kirk’s statement was the most powerful denunciation of Trump to come from Republicans on Capitol Hill, but it was hardly the only one, suggesting that Trump’s racist attacks are finally starting to worry GOP lawmakers. Sen. Jeff Flake (R-Ariz.), one of the few Republican senators who have not backed Trump, went a step further, arguing that Trump’s comments could motivate Republicans to challenge him at the party’s convention in July. “Where there’s no talk of a convention challenge or anything else, this might spur it,” he told reporters on Capitol Hill. “Let’s face it: meet the old Trump, just like the new Trump. We’ve got what we’ve got. That’s not somebody who can win the White House"."
