Clinton retweets Sanders’s attack on Trump
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Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonWarren policy ideas show signs of paying off Biden at campaign kickoff event: I don't have to be 'angry' to win Top Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem MORE showed a rare moment of unity with rival Sen. Bernie SandersBernie SandersHere are the potential candidates still eyeing 2020 bids Sanders unveils education plan that would ban for-profit charter schools Warren policy ideas show signs of paying off MORE (I-Vt.), as the two landed on the same side regarding Donald TrumpDonald John TrumpTrump calls for Republicans to be 'united' on abortion Tlaib calls on Amash to join impeachment resolution Facebook temporarily suspended conservative commentator Candace Owens 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.