Democratic presidential candidate Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE on Wednesday rejected the notion that his attacks on rival Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE provide fodder to Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE as he pivots toward the general election.

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During an interview with MSNBC's Andrea Mitchell, Sanders huffed at the idea that Clinton is struggling to stay afloat as she deflects attacks in the primary from Sanders and Trump, the presumptive Republican presidential nominee.

"Oh, really? Andrea, in every state that we have won, in 19 states, we have had to take on the entire Democratic establishment. We have had to take on senators and governors and mayors and members of Congress, so please do not moan to me about Hillary Clinton's problems," Sanders said.

He continued to say, as he has in the past, that he will "fight for every last vote that we can get."

Sanders won Tuesday's West Virginia primary, but the Vermont senator still faces a daunting climb if he wants to wrestle the Democratic nomination from Clinton, the current front-runner.

Despite losing by double digits on Tuesday night, Clinton has 94 percent of the delegates needed to clinch the nomination. She needs 144 more delegates to meet the 2,383 delegate threshold, according to The Associated Press.

Sanders can't reach 2,383 delegates without winning over more superdelegates, the party leaders who can vote for any candidate.

However, Sanders continues to say he will remain in the race until the last state votes in the primary.

"I know it's a steep climb. ... We still have the possibility of coming in with the majority of pledged delegates," Sanders said.