Beie Sanders is blasting out mixed messages about his presidential campaign plans once the dust settles from Tuesday’s last major batch of primaries – on one hand vowing to fight to the convention, and on the other saying he’ll “assess” his options Wednesday, as he retus home to Burlington.

The speculation is swirling as Sanders faces mounting pressure from senior Democrats to step aside and let likely nominee Hillary Clinton charge ahead in the general election battle against Donald Trump. President Obama reportedly is expected to get behind Clinton in a matter of days.

But Sanders’ plans are the big X-factor.

Senate Democratic Whip Dick Durbin, of Illinois, said Tuesday, when asked whether Sanders may quit the race, “All bets are off until the convention.”

Sanders’ campaign lashed out at the media oveight after the Associated Press declared that Clinton had reached the necessary 2,383 delegates to clinch the nomination.

“There is nothing to concede,” he told KTVU. “Secretary Clinton will not have the requisite number of pledged delegates to win the Democratic nomination. She will be dependent on superdelegates.”

The latest headlines on the 2016 elections from the biggest name in politics. See Latest Coverage →

Superdelegates are the party insiders and officials free to support whichever candidate they want. Their support helped bring Clinton to the 2,383 delegate threshold, and Sanders has argued all along that he intends to court them in hopes of luring them to his side before the convention.

Still, Clinton has a substantial lead in pledged delegates as well. She has the support of 1,812 pledged delegates won in primaries and caucuses, and the support of 571 superdelegates.

At a press conference late Monday, Sanders indicated he’ll consider his options once Tuesday’s primaries are over. In a potentially telling sign, he’s retuing to Burlington after the votes.

Sanders’ big goal Tuesday night is to win the marquee Califoia primary, worth 475 delegates. Also voting Tuesday are Montana, New Jersey, New Mexico, North Dakota and South Dakota.

Republicans are casting votes in all those contests save for North Dakota.

Trump will speak to the media at 9 p.m. ET Tuesday night.

Trump has already locked up the nomination, however, and for weeks has effectively been ruing a general election campaign.

On Tuesday, the frustration among Sanders supporters was evident on social media, as his backers accused AP and television networks of stifling voter tuout and relying upon superdelegates who won't formally cast their vote until the party's Philadelphia convention in July.

Sanders spokesman Michael Briggs said the campaign's job is to convince the superdelegates that the Vermont senator is "by far the strongest candidate against Donald Trump." He said calling the Democratic contest before superdelegates formally vote at the convention was a "rush to judgment."

In the AP's survey, which began in late 2015, no superdelegate has flipped support from Clinton to Sanders. None has suggested that could happen.

Since their creation in 1982, superdelegates have rarely strayed from their original endorsements -- unless there is a change in the pledged delegate tally. In 2008, some superdelegates flipped from Clinton to Obama after he overcame her early lead in pledged delegates."

Clinton's faithful also worried that the call might affect tuout in Califoia, where the former secretary of state seeks victory to stifle Sanders' momentum. Said actress Eva Longoria during a Clinton fundraising concert in Los Angeles: "Don't let that keep you away tomorrow. We need Califoia. We need New Jersey, we need North Dakota. Please find your polling place and help Hillary create history."

The Associated Press contributed to this report.