The accountant who confirmed that leaked 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 tax returns were legitimate is pushing back against the billionaire’s claims that he “brilliantly” used tax laws to avoid paying federal taxes.

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“I did all the tax preparation. He never saw the product until it was presented to him for signature,” Jack Mitnick told Inside Edition on Tuesday.

Trump bragged about using the tax laws to his benefit at a rally on Monday in Pueblo, Colo., a few days after his 1995 tax information was sent to The New York Times.

“I mean, honestly, I have brilliantly — I have brilliantly used those laws,” the GOP nominee said.

"I have often said on the campaign trail that I have a fiduciary responsibility to pay no more tax than is legally required, like anybody else, or put another way: to pay as little tax as legally possible.”

It's an argument his campaign surrogates have been repeating since the report broke on Saturday, even as Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE and her campaign attack him as the “poster-boy for the same rigged system he would make even worse.”

But Mitnick said the praise of Trump's business acumen is not valid.

“I’m the one who did all the work,” Mitnick said.

The New York Times on Saturday wrote about Trump’s leaked tax returns from 1995, when he declared a nearly $1 billion loss that could have allowed him to legally avoid paying federal income taxes for up to 18 years.