Sen. Barbara BoxerBarbara Levy BoxerHillicon Valley: Ocasio-Cortez clashes with former Dem senator over gig worker bill | Software engineer indicted over Capital One breach | Lawmakers push Amazon to remove unsafe products Ocasio-Cortez blasts former Dem senator for helping Lyft fight gig worker bill Only four Dem senators have endorsed 2020 candidates MORE (D-Calif.) on Tuesday defended Hillary ClintonHillary Diane Rodham ClintonTrump's economic approval takes hit in battleground states: poll This is how Democrats will ensure Trump's re-election The Hill's Morning Report - Trump takes 2020 roadshow to New Mexico MORE's decision not to participate in another debate with Bernie SandersBernie SandersChamber of Commerce argues against Democratic proposals for financial transaction taxes Top Sanders adviser: 'He is a little bit angry' Working Families Party endorses Warren after backing Sanders in 2016 MORE before California's primary.

“We’ve had nine debates,” said Boxer, a Clinton supporter, on MSNBC’s “Andrea Mitchell Reports." "I know everything that Bernie has to say and that Hillary has to say at a debate.

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“I think everyone knows the distinctions and the differences and the parts of each of those candidates’ platforms where there’s agreement,” she added..

“People are smart. They know what’s happening. They know who stands for what and how and who. They know what’s going on.”

Clinton on Monday declined to debate Sanders in California ahead of its June 7 Democratic presidential primary.

“We believe that Hillary Clinton’s time is best spent campaigning and meeting directly with voters across California and preparing for a general election campaign that will ensure that the White House remains in Democratic hands,” communications director Jennifer Palmieri said in a statement.

Sanders, who has been pressing Clinton to debate him, blasted her decisioin on Monday.

"I was disturbed, but not surprised, that Secretary Clinton has backed out of the debate,” he said at a rally in Santa Monica, Calif.

“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 Californians address the major crises we face,” the independent Vermont senator added.

California offers 475 pledged Democratic delegates, making the Golden State the largest prize in the party’s primary.

Clinton is the Democratic front-runner, boasting 1,768 delegates to Sanders’s 1,497. The candidates need 2,382 to seal the nomination before the convention.

Sanders has stepped up his attacks on Clinton in recent weeks.

Boxer on Tuesday said Clinton and Sanders must eventually make peace after their at times bitter contest.

“It is time for us to unite, not to keep on being divisive, one against the other,” she said on MSNBC. 

“The bottom line is Bernie can stay in as long as he wants, as long as we’re listening to each other, we’re respectful of one another. I know what happen when that isn’t the case and it’s damaging to our democracy."