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Vermont Sen. Bernie Sanders got a rock star’s welcome when he spoke in downtown Los Angeles on Sunday in what was theoretically a book tour stop but amounted to more of a political rally, urging progressives to play by new rules as they resist President Trump’s administration.

“We are looking at a totally new political world,” he said. “If we play by the old rules, we will lose and they will win. Our job is not to play by the old rules.”

Sanders, 75, used the stage at the Theatre at the Ace Hotel as part of Los Angeles Times Ideas Exchange to buttress his pitch to reshape and redefine the Democratic Party after its 2016 drubbing.

Since Trump’s electoral college victory, Sanders has secured a spot on the Senate Democrats’ leadership team and begun to reassert the populist political vision that won him millions of votes against Hillary Clinton in the Democratic presidential primary.

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