Clinton retweets Sanders’s attack on Trump
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Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonPompeo: 'We've not been successful' in changing US-Russia relations Michael Moore ties Obama to Trump's win in Michigan in 2016 The Memo: Could Kavanaugh furor spark another ‘year of the woman’? MORE showed a rare moment of unity with rival Sen. Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE (I-Vt.), as the two landed on the same side regarding Donald TrumpDonald John TrumpSunday shows preview: Trump sells U.N. reorganizing and Kavanaugh allegations dominate Ex-Trump staffer out at CNN amid “false and defamatory accusations” Democrats opposed to Pelosi lack challenger to topple her 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.