CHICAGO (CBS) — Mayor Rahm Emanuel criticized GOP presidential hopeful Donald Trump for “playing with dark forces” in failing to distance himself from white supremacists and the Ku Klux Klan, reports WBBM Political Editor Craig Dellimore.

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When questioned, Republican frontrunner Donald Trump was hesitant to renounce support from former Ku Klux Klan leader David Duke and white supremacist groups who have made statements supportive of him. He said he wouldn’t condemn people or groups he knew nothing about. Trump later said, “I disavow” in regard to Duke.

Mayor Emanuel said Trump shouldn’t have to do research to condemn people like Duke but should do so on instinct.

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“His statements or the lack of clarity around his statements, you know you sleep in the bed you make and I think playing with dark forces come back to haunt you and this is not a joke,” Emanuel said.

The mayor spoke with reporters after casting an early ballot in the Illinois Primary.

Former Trump rival Chris Christie may now support Trump, but many other Republicans are squirming, including Governor Bruce Rauner.

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Rauner refused to say if he’d support Trump if he’s the GOP nominee, but did say, “I will say emphatically there is no place in American society for the Ku Klux Klan there, is no place in American society for racism and bigotry.”