Sanders returning to campaign trail for Clinton
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Sen. Bernie SandersBernie SandersOvernight Energy: Treasury creates hub to fight climate change through finance | Sanders, Ocasio-Cortez introduce 'Green New Deal for Public Housing' | Don't attack Zoom for its Bernie Sanders federal tax bill Sanders, Ocasio-Cortez introduce 'Green New Deal for Public Housing' MORE (I-Vt.) will be returning to the campaign trail next month to stump for Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' MORE.

"I look forward to it," Sanders told The Washington Post Friday. 

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"I feel very strongly that Donald TrumpDonald TrumpHouse votes to condemn Chinese government over Hong Kong Former Vice President Walter Mondale dies at age 93 White House readies for Chauvin verdict MORE would be a disaster for the country. I want to do everything I can to see that Secretary Clinton wins." 

Sanders spent a year on the trail for his own presidential campaign, before dropping out and endorsing Clinton last month.

He spoke on her behalf at the Democratic National Convention, but faced backlash from some of his supporters who say Clinton benefited from a rigged primary process. 

Sanders has pleaded with his supporters to back Clinton. Now he's expected to hit the campaign trail to target the working-class and younger voters. 

He plans to visit New Hampshire, Maine, Michigan and Wisconsin — all states where he won primaries and caucuses — as well as others were he had strong support such as Ohio, Pennsylvania and Nevada. 

He'll also campaign for Democratic Senate candidates including Katie McGinty in Pennsylvania, Ted Strickland in Ohio and Maggie Hassan in New Hampshire.