TRENTON -- Republican presidential nominee Donald Trump will release his tax returns after the conclusion of an IRS audit, his running mate Mike Pence said Sunday.

Pence added that he will release his own tax returns shortly after the Labor Day holiday.

"Donald Trump and I are both going to release our tax returns," Pence said on NBC's "Meet the Press." He added: "I'll release mine in the next week."

Trump has repeatedly resisted calls to release the documents, saying he is under audit by the Internal Revenue Service (IRS). Pence said the returns would be released "at the completion of an audit."

It's not clear, however, whether the audit will be concluded in time for the November election, and the IRS has said that there are no laws preventing Trump from releasing them sooner.

Pressed by moderator Chuck Todd about whether they'd become available before voters went to the polls, the Indiana governor answered, "Well, we'll see."

Late last month, Trump's son and campaign adviser Eric Trump said it would be "foolish" for his father to release his tax returns, because "you would have a bunch of people who know nothing about taxes trying to look through and trying to come up with assumptions on things they know nothing about."

Pence recently told ABC Radio that his family had "not become more wealthy as a result of 16 years in public service" insisting, "we're a middle-class family."

Democratic presidential nominee Hillary Clinton and her running-mate Gov. Tim Kaine of Virginia released their 2015 returns last month.

The Clintons earned $10.6 million in 2015, and paid an effective federal income tax rate of 34.2 percent, and donated 9.8 percent of their adjusted gross income to charity.

The Washington Post reported in July that Trump has given nothing to his own charitable foundation since 2008, and gave less than $10,000 of his own money over to charity over the last 7 years.

Claude Brodesser-Akner may be reached at cbrodesser@njadvancemedia.com. Follow him on Twitter @ClaudeBrodesser. Find NJ.com Politics on Facebook.