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Rep. Jason Chaffetz says Donald Trump should release his tax returns and more information about his health.

"If you're going to run and try to become the president of the United States, you're going to have to open up your kimono and show everything: your tax returns, your medical records," said the Republican congressman from Utah, a Trump supporter and the chairman of the House Oversight and Government Reform Committee, during an appearance Wednesday on CNN. "You're just going to have to do that. It's too important. So both candidates, Donald Trump and Hillary Clinton, should show both their medical records and tax returns, absolutely."

Trump has said he'd release his tax returns at the conclusion of an audit, breaking a longstanding tradition of candidates releasing their tax information. Clinton released her tax returns from the past year earlier this month and had previously disclosed eight years of data.

Neither Clinton, who is 68, nor Trump, 70, has released much about their personal health, beyond basic letters from doctors, Clinton's letter being more detailed than one from Trump's gastroenterologist.

Chaffetz's call for more disclosure came during an interview during which he kept up his criticism of Clinton for meetings she held with donors to her family's charity while she was secretary of state.

The Democratic polling firm Public Policy Polling released results from a Utah survey this week that showed 65 percent of the state's likely voters think Trump should release his tax returns. Even a plurality of his supporters, 44 percent, said he should be more transparent, while 36 percent said he didn't need to.

Mitt Romney, the 2012 Republican candidate and one of the more strident anti-Trump voices in the party, has repeatedly called on Trump to release his returns, suggesting there's probably a "bombshell" in the documents.

Trump, who has called Romney a "loser," has said his tax forms are complicated and lengthy.

He told The Associated Press in May that "there's nothing to learn from them."

Twitter: @mattcanham