Sen. Brian Schatz (D-Hawaii) on Wednesday questioned why the Democratic party is still litigating the 2016 presidential primary between Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE and Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.).

Why are people still talking about Hillary vs Bernie? What a waste of energy. 2017 is about resisting and rebuilding. — Brian Schatz (@brianschatz) April 20, 2017

Sanders waged a tough primary campaign against Clinton last year, presenting himself as a progressive alternative to the former secretary of State.

The Vermont senator endorsed Clinton last July when it became clear she would become the 2016 Democratic nominee.

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Sanders said Tuesday that he does not consider himself a Democrat, even as he joins Democratic National Committee chairman Tom Perez in a national unity tour.

“No, I’m an Independent,” he said when asked by MSNBC’s Chris Matthews whether he now identifies as a Democrat.

Sanders also believed that Clinton’s “I’m with her” slogan last year was “phony,” according to a new book by The Hill’s Amie Parnes and Sidewire’s Jonathan Allen.

“It’s so phony!” he said when he was approached to record an ad for Clinton’s campaign last September. “I don’t want to say that.”

More recently, Sanders has drawn fire from Democrats for saying he isn't sure that high-profile Democratic Georgia special election candidate Jon Ossoff is as a "progressive." But Sanders remains popular, ranking as the most popular active politician in a recent poll.