Democratic presidential candidate Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE pushed back at a Monday press conference after a journalist asked whether his continuing campaign against front-runner Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina 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 Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally 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.