Clinton retweets Sanders’s attack on Trump
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Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonGOP political operatives indicted over illegal campaign contribution from Russian national in 2016 Clinton lawyer's indictment reveals 'bag of tricks' Attorney charged in Durham investigation pleads not guilty MORE showed a rare moment of unity with rival Sen. Bernie SandersBernie SandersPelosi says House members would not vote on spending bill topline higher than Senate's Groups push lawmakers to use defense bill to end support for Saudis in Yemen civil war Congress must address the looming debt crisis MORE (I-Vt.), as the two landed on the same side regarding Donald TrumpDonald TrumpTrump takes shot at new GOP candidate in Ohio over Cleveland nickname GOP political operatives indicted over illegal campaign contribution from Russian national in 2016 On The Money — Dems dare GOP to vote for shutdown, default MORE’s delay in denouncing the Ku Klux Klan this week.

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“America's first black president cannot and will not be succeeded by a hatemonger who refuses to condemn the KKK,” Sanders tweeted, which Clinton's account retweeted several minutes later.

Trump, who is increasingly seen as the GOP’s likely nominee, has walked into a firestorm of criticism this week after receiving an endorsement from white supremacist David Duke.

As recently as Sunday morning, Trump had declined to condemn Duke’s racism. In an interview with CNN’s “State of the Union” on Sunday morning, Trump avoided a question about whether he'd condemn Duke's racism.

Later Sunday afternoon, Trump took to Twitter to formally denounce the former Ku Klux Klan grand wizard’s endorsement.