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 lashed out 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 at a campaign stop in Columbus, Ohio, on Wednesday, calling on him to “release your tax returns or shut up.”

Biden’s comments come after the president has launched attacks against Biden and his son, Hunter Biden. Trump has called for an investigation into Hunter Biden’s business ventures in Ukraine.

House Democrats in their impeachment inquiry are investigating whether Trump tried to pressure Ukraine into opening an investigation into the Bidens. Trump has not provided any evidence of criminal wrongdoing by either Biden.

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“My son’s comments speak for themselves. Let’s keep the focus here. The president of the United States says he wants to talk about corruption. Well, let’s talk about corruption. He is running the most corrupt government in the history of the United States of America, number one. Number two, he also is in a position where, as he talks about corruption, he is engaged in practices that, in fact, everyone around the world is looking and saying ‘how in God’s name can this man be doing that while he’s president?’” Biden said.

“Mr. President, you want to talk about corruption,” Biden continued. “I’ve released 21 years of my tax returns. I entered as one of the poorest men in Congress, left one of the poorest men in government, in Congress, and as vice president. I made no money while I was in there other than my salary. Mr. President, even Richard Nixon released his tax returns. Mr. President, release your tax returns or shut up.”

"Mr. President, release your tax returns or shut up," says former VP Joe Biden as he accused Trump of running a "corrupt government" and defended his son Hunter's Ukraine work.https://t.co/Oz9SORJCCA pic.twitter.com/G2I6om1LJT — CNN Newsroom (@CNNnewsroom) October 16, 2019

Biden said he would not change anything about his son’s former position on the board of a Ukrainian gas company and that he did not discuss the country with him.

“Let’s focus on what the problem is here. The problem is a corrupt president. The reason why he is running after me is he knows I will beat him like a drum,” Biden added. “He understands that.”

Biden also blasted President Trump’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE among others. Several of Giuliani’s associates have been arrested in the last week for allegedly violating campaign finance laws.

“This is so obvious. And as I said, Rudy Giuliani and the henchmen and Trump’s lawyers? How many of these folks are in jail? These are the president’s people for God’s sake, this is a thoroughly corrupt outfit,” Biden alleged.

Trump told reporters that he did not know the men last week, calling them “clients of Rudy’s.”