Democratic presidential candidate Bernie SandersBernie SandersHere are the potential candidates still eyeing 2020 bids Sanders unveils education plan that would ban for-profit charter schools Warren policy ideas show signs of paying off MORE pushed back at a Monday press conference after a journalist asked whether his continuing campaign against front-runner Hillary ClintonHillary Diane Rodham ClintonWarren policy ideas show signs of paying off Biden at campaign kickoff event: I don't have to be 'angry' to win Top Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem MORE is sexist, given Clinton will likely secure the Democratic nomination. 

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The journalist interrupted Sanders as he tried to call on another reporter, repeatedly asking the Vermont senator how he’d address women who say he is acting sexist for standing in the way of Clinton becoming the first female presidential nominee in American history.

"Is that a serious question? Your question implies that any woman who is running for president is by definition the best candidate," he said during a press conference in California a day before the state's primary. 

"If Hillary Clinton runs for president, your point is that it's sexist for any man to oppose her? I don't think it's sexist. I think the issue is, first of all, our focus right now is running and winning right here in California. And the second point that I have made is that it is absolutely imperative that we defeat Donald TrumpDonald John TrumpTrump calls for Republicans to be 'united' on abortion Tlaib calls on Amash to join impeachment resolution Facebook temporarily suspended conservative commentator Candace Owens MORE."

Clinton is all but assured to secure the delegates needed to win the nomination on Tuesday — she currently sits just a handful short, with hundreds up for grabs during Tuesday's primaries in California and other states. 

Sanders won't likely be able to catch Clinton before the Democratic National Convention in late July and would instead need to flip hundreds of party leaders supporting her — known as superdelegates — over to his side. 

"Our goal is to get as many delegates as we possibly can and to make the case to superdelegates that I believe the evidence is fairly strong that I am the strongest candidate," Sanders said. 

He added that a victory in California and the other remaining states could help woo superdelegates over to his side, but then elaborated that about four party leaders in "three or four states" are moving his way. Sanders would likely need to flip hundreds in order to secure the nomination.