Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE ripped President Trump in Las Vegas on Saturday, saying that American values “are being shredded by a president who’s all about himself.”

Biden made a speech to a local union right before Trump took the stage for a campaign rally in Elko, Nev., to boost Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (R-Nev.) and Republican gubernatorial candidate Adam Laxalt.

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Biden said the U.S. was founded “on an idea, the American idea, basic fundamental decency, and it’s being shredded.”

“But my God, think of what’s going on now,” he said, adding that those values “are being shredded by a president who’s all about himself. It’s all about Donald.”

Biden also took a shot at the Republican Party at large, saying that their dedication to political success superseded their love of country.

“Because of gerrymandering and unlimited spending” the GOP is “in fact choosing party over their country,” he said.

Biden and Trump have long feuded with each other, with Biden saying in October 2016 “I'd like to take himself behind the gym if I were in high school.”

Trump has long mocked the comment and slammed the former vice president Saturday, joking about his past unsuccessful presidential runs and calling him “Sleepy Joe Biden” and “Creepy Joe.”

Biden is known to be considering a presidential run against Trump in 2020. Should he run, Biden would likely join a crowded field of Democrats seeking to prove their anti-Trump bona fides to a political base that that is largely animated by opposition to the president.