Boxer: Sanders calling Jerry Brown establishment is 'biggest joke of the day'

Barbara Boxer is sick of Bernie Sanders calling all of Hillary Clinton’s supporters “establishment.”

“I love Bernie, he’s my friend for a long time. But you can't just dis everybody who supports Hillary Clinton,” the retiring California senator and Clinton surrogate said on MSNBC’s Morning Joe Wednesday.

Boxer was referring specifically to comments Sanders had made Tuesday that associated California Gov. Jerry Brown — who said on Tuesday he would be voting for Clinton in the state's primary next week — with the Democratic establishment.

"It’s not surprising to me that, you know, we will have the Democratic establishment supporting Hillary Clinton," Sanders said to reporters Tuesday, according to the Sacramento Bee. "I like Jerry Brown, but people can make their own choices.”

"For Bernie to say that Jerry Brown is establishment is kind of the biggest joke of the day," Boxer said. “Just because you're supporting Hillary doesn't mean you're, quote, 'the establishment.'  It means you're progressive and you want to see her. She's so qualified for the post. She's just what we need.”

The tension between Clinton’s surrogates and the Vermont senator's campaign has continued to mount as it looks more likely that Clinton will capture the Democratic nomination.

Clinton — who is nearly 800 delegates ahead of Sanders when superdelegates (party leaders and elected officials free to support anyone) are included, according to the Associated Press — is less than 80 delegates away from securing the 2,383 needed to win the Democratic nomination.

Sanders has vowed to keep fighting and hopes to flip some of the superdelegates to his side.

"On Tuesday night, on the 7th, you're going to hear from media saying that Hillary Clinton has received, whatever it is, 80 or 90 delegates, which she certainly will from New Jersey and other states," Sanders said during a rally Tuesday, according to The Washington Post. "And they'll say, the primary process is over, Secretary Clinton has won."

But, he added: That is "not factually correct" — it is superdelegates who will determine the nominee.

On June 7, California, Montana, New Jersey, New Mexico, North Dakota and South Dakota will all have Democratic contests.