Las Vegas (CNN) Former Vice President Joe Biden took a swipe Saturday at President Donald Trump as the former vice president rallied Democrats in Las Vegas shortly before the President was set to hold a rally of his own a few hundred miles north of here in Elko.

Rallying Democrats and union workers at an early vote rally, Biden said American values "are being shredded."

"They're being shredded by a President who's all about himself. It's all about Donald. It's not about anything else," Biden said at the Culinary Workers Union Local 226.

A short time later in Elko, Trump fired off his own attack at the former vice president.

"He never had more than one percent. So we call him either Sleepy Joe Biden or One Percent. Which is better?" Trump asked the crowd, which responded with shouts and cheers.

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