In another clip, he tells an interviewer that "if you didn't see the returns you would think there is almost like something wrong. What's wrong?"

The online video released Friday is the latest attempt by the Democratic ticket to sow doubt among voters about Trump's honesty and fitness for the job. As Clinton regularly points out on the trail, candidates have released their tax returns going back four decades, and some 30 years of her tax information is in the public realm.

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Clinton and running mate Sen. Tim Kaine (Va.) are expected to release their 2015 tax returns as soon as Friday. The release is also expected to include Kaine's records going back a decade.

The new video features 2012 Republican nominee Mitt Romney, Senate Majority Leader Mitch McConnell and other Republican and conservative voices saying Trump should release the tax material. He has said he cannot do so now because of an ongoing audit.

"We will only really know if he's the real deal or a phony if he releases his tax returns," Romney says in a speech excerpted in the Clinton video.

The video lists some possible reasons for the delay, without offering proof, including that Trump may not have paid as much in tax or given away as much in charity as he has claimed.

President Richard Nixon released his returns despite an audit, a Clinton campaign statement about the new video said. The audit is also complete for Trump’s tax returns from 2002 to 2008, the campaign noted, so there would theoretically be no bar to release of that material.

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The Clinton campaign has published the past eight years of Clinton’s personal tax returns, covering 2007 through 2014, on her campaign website. The Clinton family returns for 2000 through 2006 were released during her 2008 campaign. Separately, returns from 1992 through 1999 were disclosed annually during Bill Clinton's presidency, and previous returns were released by her husband’s presidential campaign.

The

has all of the past candidates' returns.