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 on Monday warned that women running for president in 2020 will face a "double standard."

During an appearance in California as part of her book tour, Clinton addressed what she would say if she were advising Sens. Kamala Harris Kamala HarrisHarris honors Ginsburg, visits Supreme Court The Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump MORE (D-Calif.) or Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), both seen as possible presidential candidates, on a potential 2020 bid.

“You have to have a high pain threshold, because the double standard is alive and well," Clinton said, according to Politico.

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"This is endemic to our political system, to business, to the media, to every part of society. So don’t be afraid to talk about it and take it on.”

The 2016 Democratic presidential nominee warned that women running for president should be ready to "have the most horrible things said about you."

“There’s a particular level of vitriol, from both the right and the left, directed at women,’’ she said.

“Make no mistake about that.”

Clinton has been promoting her new book, "What Happened," a chronicle of her election defeat.

The former first lady, senator and secretary of State has also been taking aim at President Trump in recent interviews, blasting the president for his actions.