Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE on Monday night said it’s “a little bit insulting” to California voters that Democratic front-runner Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE refuses to debate him ahead of the state’s primary.

“I was disturbed, but not surprised, that Secretary Clinton has backed out of the debate,” Sanders said at a rally in Santa Monica, Calif., ahead of the delegate-rich June 7 primary.

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“I think it’s a little bit insulting to the people of California — our largest state — that she is not prepared to have a discussion with me about how she will help the Californians address the major crises that we face,” he continued.

Prior to his rally, Clinton communications director Jennifer Palmieri sent out a statement about the former secretary of State’s decision to decline to debate Sanders.

“We have declined Fox News’ invitation to participate in a debate in California,” Palmieri said. “As we have said previously, we plan to compete hard in the remaining primary states, particularly California, while turning our attention to the threat a Donald Trump presidency poses.”

The Vermont senator had been pushing Clinton to debate before the June 7 primary. California offers 475 pledged Democratic delegates, the largest prize of any state.

Clinton’s decision to pass on the debate comes days after a CNN interview in which the former secretary of State said she thinks the race for the Democratic nomination is all but over, saying there's "no way" she won't be the party's nominee. The Sanders camp fired back at her comment and said that millions of Americans have “growing doubts” about her candidacy.

Sanders has acknowledged he has an uphill battle in winning the nomination. Clinton is 90 delegates short of the nomination when including superdelegates — unbound party leaders who vote at the national convention — while Sanders needs almost 850 delegates to clinch the nomination, according an Associated Press tally. Despite Clinton's lead, Sanders has vowed to remain in the race and keep fighting for delegates.