Chants of “lock him up” erupted at President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's campaign-style rally Thursday night in Minneapolis after the president's son Eric Trump Eric Frederick TrumpJudge orders Eric Trump to comply with New York AG's subpoena before Election Day Eric Trump uses misleading clip to blast Biden for using teleprompter Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE attacked former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a top Democratic presidential contender.

“How do you think Joe Biden and his — how do you think his son is feeling right now, right after embezzling a lot of money, taking a lot of money, the crookedness,” Eric Trump said to a booing audience of Trump supporters. “Right, he’s not looking too good, either.”

“Maybe ‘lock her up’ goes to ‘lock him up,’” he joked, referencing the popular refrain President Trump and his supporters used to attack former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE during the 2016 election.

“I don’t know, I like ‘lock her up’ a little bit more, but thank you, that’s a good idea,” the president’s son continued.

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The rally crowd began chanting “lock him up” in attacking Biden, referencing unsubstantiated allegations by the president that Biden and his son acted corruptly in their dealings with Ukraine. Biden has continued to deny the allegations and insists Trump is making up lies about him.

The younger Trump added at the rally: “Hey guys, we don’t need to lock him up — we’re going to beat the hell out of all of them. We’re going to win. You know why? Because America is winning again. Because of my father, America is winning again.”

President Trump is under scrutiny for his contacts with Ukraine and for urging the country’s president to investigate the Bidens.

Reports of his urging a foreign government to look into a major political rival ahead of the 2020 election have spurred Democrats to launch an impeachment inquiry against him.