Sen. Bernie SandersBernard (Bernie) SandersTrump claims a 'spy' on his campaign tried to help 'Crooked Hillary' win Rising star Abrams advances in Georgia governor race Webb: Drain the swamp MORE (I-Vt.) on Thursday vowed not to let President-elect Donald TrumpDonald John TrumpOn North Korea, give Trump some credit Exclusive: Bannon says Rosenstein could be fired 'very shortly' GOP dissidents on cusp of forcing immigration votes MORE get away with going after minority groups.

"If Donald Trump takes people's anger and turns it against Muslims, Hispanics, African Americans and women, we will be his worst nightmare," the Vermont senator tweeted.

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Sanders on Wednesday released a statement signaling a willingness to work with Trump on certain policies.

“To the degree that Mr. Trump is serious about pursuing policies that improve the lives of working families in this country, I and other progressives are prepared to work with him," the Vermont senator said in a statement released Wednesday.

"To the degree that he pursues racist, sexist, xenophobic and anti-environment policies, we will vigorously oppose him.” 

After battling Hillary ClintonHillary Diane Rodham ClintonDem targeted by party establishment loses Texas primary Penn to Hewitt: Mueller probe born out of ‘hysteria’ Trump claims a 'spy' on his campaign tried to help 'Crooked Hillary' win MORE in the Democratic presidential primary, Sanders endorsed Clinton and campaigned for her and against Trump in battleground states.

Throughout the presidential race, the Vermont senator made the case for why voters should support Clinton and cast Trump as unqualified for the White House.