Bernie Sanders resumed slapping at his Democratic rival Hillary Clinton with a little prodding from late night host Jimmy Kimmel.

Sanders stopped by the studios of Jimmy Kimmel Live! in Hollywood only to be shown a clip from Clinton's interview last week with CNN's Chris Cuomo where she declared, 'I will be the nominee for my party ... That is already done.'

Sanders scoffed and muttered, 'Just a tinge arrogance there I think.'

He then waged a fresh attack after barely mentioning his rival at his packed rallies over the last several days.

'The people of Indiana a couple of weeks ago, the people of West Virginia, the people of Oregon, who gave us a pretty good victory, don't quite agree with Secretary Clinton's assessment and we split Kentucky,' Sanders said of his string of recent wins.

'And I kind of think that on June 7 the people of California will have a message for Secretary Clinton,' Sanders warned.

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Sen. Bernie Sanders joined Jimmy Kimmel for a taping today in Hollywood while on a Southern California swing before the state's pivotal June 7 primary

Sen. Bernie Sanders credited Jimmy Kimmel for facilitating a proposed debate between himself and presumptive Republican nominee Donald Trump

Bernie Sanders also used the television appearance to again hit Hillary Clinton, calling out her 'arrogance' for proclaiming last week on CNN that she was already the Democratic nominee

Last night the Los Angeles-based late night show set the scene for the political news of the day.

Kimmel had Donald Trump on as his guest and presented the Donald with a question from Sanders, knowing the two presidential hopefuls would be appearing on back-to-back shows.

Sanders wanted to know if Trump would step up to the plate and debate him, after the news broke that Clinton had backed out of a California confab, a move Sanders said tonight was 'kind of insulting to people in the largest state in the United States of America.'

California is also the most delegate-rich.

As for the debate proposition, Trump said yes with conditions, while Sanders expressed an eagerness too.

For Sanders, whose small dollar donations have dwindled as Clinton has marched closer to the nomination, it's free media time in an important market that he badly needs.

For Trump, who no longer has primary opponents, it keeps him fully in the political conversation as he looks forward toward the general election.

Kimmel, introducing Sanders as the 'most popular 74-year-old in the United States' and the 'biggest name to come out of Burlington since the coat factory,' sought credit for what he had done.

'You made it possible for us to have a very interesting debate,' Sanders stated.

The self--proclaimed democratic socialist said it would be between 'two guys who look at the world very, very differently.'

Bernie Sanders has vowed to fight on and told Jimmy Kimmel on tonight's show that the people of California would send a 'message' to Hillary Clinton for jumping the gun on the nomination

Repeating what he said earlier today on the campaign trail, Sanders said the 'goal would be to have them in some big stadium here in California,' saying that some networks, including Kimmel's home base of ABC, have expressed interest in airing what could be must-see TV.

'I feel like I should be the moderator of this debate, right?' Kimmel suggested during the broadcast.

The host also presented Sanders with Trump's question.

'Dear Crazy Bernie, Will you run [as] a third-party communist against Crooked Hillary or are you a coward and a loser? Signed, President Trump,' Kimmel read off a notecard.

The comedian then laughed, saying that wasn't really it.

'He asks, "Bernie, you have been treated very unfairly. Both primary systems are rigged, but in particular the Democrats ridiculous system of superdelegates. Will you run as an independent when Debbie Wasserman Schultz and the party bosses steal the nomination away from you?'" Kimmel read.

Sanders didn't say no, but rolled his eyes at the thought.

'Well, I think there's a little bit of self service there for Donald Trump,' Sanders answered, suggesting an independent bid would split up the country's political left, throwing the election toward Trump.

'You think he's really worried about me?' he mused.

'Well, you tell Mr. Trump, I really do appreciate his concern for me. I know it comes straight from his heart. But tell him that what I hope will happen is that, in fact, I will run against him as the Democratic nominee for president of the United States,' Sanders continued.

Jimmy Kimmel also had a little fun with Bernie Sanders, showing the Vermont senator a picture of him walking the streets in front of an ill-placed sign

'And if I do we're going to beat him and beat him bad,' the Vermont senator added.

The Democratic underdog also gave Kimmel his view of the state of the race.

'There's some confusion about this,' Sanders suggested.

Kimmel asked Sanders if he needed to win California by a lot.

'Yeah, here's where we are,' he said. 'In terms of what we call pledged delegates, which I call the real delegates that you win by elections, we're at 46 percent, so we're behind.'

Sanders would have to win the majority of the remaining states by overwhelming margins to overtake Clinton's lead.

He was again critical of the Democratic superdelegates, more than half of whom have already committed to vote for Clinton at the Democratic National Convention, calling them 'patently absurd and undemocratic and kind of dumb.'

Kimmel tried to have a little fun with his political guest too.

He asked Sanders what his life has been like now that it's in 'Secret Service lockdown mode' asking the senator if he could still walk the street freely like he did several months ago.

Kimmel then threw up a picture of Sanders with his fist clinched in the air.

The photo was awkwardly taken in front of a 'XXX Movie Arcade,' with its sign advertising videos, toys and lotions.

The Live! host also made the senator's anniversary plans sound slightly X-rated.

Kimmel asked Sanders what he planned to do with Jane as they celebrate 28 years of marriage on Saturday.

'Yeah, Jane and I will probably be in front of 20-30,000 people doing something,' the senator answered.

'What are you going to do in front of those people?' Kimmel asked back.