Democratic vice presidential nominee Tim Kaine Timothy (Tim) Michael KaineTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick MORE says Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE has lower ethical standards than former President Richard Nixon.

“Candidates for 40 years, both parties, this is not a partisan statement, have released their tax returns,” the Kaine, a who represents Virginia in the Senate, said late Tuesday during a rally in Lancaster, Pa.

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“Richard Nixon released his tax returns. If you can’t come up to the ethical standard of Richard Nixon, you should not be within 10 time zones of the White House.”

Kaine says Trump has an obligation to voters.

“There is some basic information that voters are entitled to know about a person who wants to be president or commander in chief,” he said. "He’s refusing to answer the questions.

“Hillary [Clinton] has put out her family’s tax returns going back to 1977, nearly 40 years, because they’ve been in public life a long time,” Kaine added.

“So my wife Anne [Holton] and I put out 10 years of tax returns so people can see them. Not just the press, they can do whatever they want, but citizens too.”

Clinton, the Democratic presidential nominee, has repeatedly urged Trump to make his tax history public.

Trump has countered he is keeping his records private until the IRS concludes a routine audit of them. The IRS has said an audit does not prevent Trump from releasing his returns.