Influential conservative Rep. Steve King (Iowa) on Monday said it may be too late for Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE to release his tax returns.

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"I just think the window for that has passed," King said Monday morning on MSNBC's "Morning Joe."

"When he said that he wouldn't release his returns till the audit was over, and he'd been being audited for 13 years, I'd say that for him to release them is just a forgone conclusion. Donald Trump will not release his tax returns."

The GOP nominee has faced backlash throughout the election for not releasing his tax returns. The IRS has said publicly that nothing prevents Trump from releasing the documents.

King said if Trump were going to release his returns, he should have done it months ago so there was time to "digest it."

"If he drops it now, into this presidential intense sprint around to the final turn part of the race, I think that would be the only discussion we would hear all the way until November," the Iowa Republican said, "judging by the way the media has treated him over the last few weeks."

Last week, Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE and her running mate, Sen. Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE (Va.), released last year's tax returns in an effort to raise the pressure on Trump. Clinton and her husband, former President Bill Clinton William (Bill) Jefferson ClintonBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Bill Clinton on GOP push to fill Ginsburg vacancy: Trump, McConnell 'first value is power' MORE, have released years' worth of returns in the past.

Indiana Gov. Mike Pence Michael (Mike) Richard PenceMcConnell locks down key GOP votes in Supreme Court fight Momentum growing among Republicans for Supreme Court vote before Election Day Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE, Trump's running mate, said this weekend he would be releasing his tax returns soon.