Sen. 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 (I-Vt.) is urging his supporters to unite behind Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE, warning that it is the only way to stop GOP presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

“It is easy to boo, but it’s harder to look your kids in the face who would be living under Donald Trump,” he told the California delegation during a breakfast meeting Tuesday, according to the Los Angeles Times.

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Sanders has made the rounds at the Democratic National Convention in Philadelphia, thanking supporters and urging them to back Clinton, the party's presumptive presidential nominee. He also spoke at the Florida and Wisconsin delegation breakfasts on Tuesday.

Those events come after his prime-time address to the convention on Monday, where he said he would work to continue his "political revolution" even as he pressed his supporters to back Clinton.

The speech capped a tumultuous first day at the convention, where Sanders supporters earlier booed Democratic National Committee (DNC) Chairwoman Debbie Wasserman Schultz off the stage in response to leaked DNC emails that showed party officials plotting ways to undermine the Vermont senator's presidential bid. Throughout the day, Sanders supporters also interrupted other speakers with chants.

Sanders's Tuesday appearance with California delegates — where his backers broke out in chants of support — put him face-to-face with leadership from the Bernie Delegates Network.

The organization encompasses nearly two-thirds of Sanders delegates and is actively looking at contesting Sen. Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE's (D-Va.) vice presidential nomination. The group notes that it is not affiliated with Sanders's campaign.

Sanders tried to preach unity with the Clinton camp ahead of the convention, endorsing the former secretary of State and appearing with her on the campaign trail.

But some stalwart Sanders supporters, wary of Clinton, have signaled they could support Green Party presidential candidate Jill Stein instead.

Sanders warned against that at a Bloomberg Politics breakfast Tuesday.

"But I think right now — what is it, three, four months before an election — you're going to end up having a choice. Either Hillary Clinton is going to become president, or Donald Trump," he said, according to The Washington Post.