Billionaire Mark Cuban on Monday slammed 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 for a recent report that said the Republican presidential nominee may have legally avoided paying federal income tax for up to 18 years.

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"After military service, the most patriotic thing you can do as a wealthy person is pay your taxes," Cuban, a vocal supporter of 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, said on CNN.

"Because that keeps the roads paid, the military paid and kids going to school, and he obviously doesn't understand the concept."

A New York Times report published Saturday said a $916 million loss Trump reported on his 1995 income tax returns could have allowed him to legally avoid paying any federal income tax for up to 18 years.

The Times obtained fragments of Trump's 1995 tax records, not previously released, that show he reported a federal adjusted gross loss of $915.7 million in the wake of financial struggles at three Atlantic City casinos, his airline business and purchase of Manhattan's Plaza Hotel.

Cuban on Monday shot back against Trump and those who argued the report actually showed Trump's genius.

"That's just wrong," Cuban said.

Trump supporters on Sunday touted the report as indicative of how clever Trump is

But Democrats and Clinton supporters said the report revealed a corrupt system and a candidate who only cares about himself.

Throughout his campaign, Trump has declined to release his tax returns, saying he is under audit by the IRS. The IRS has said nothing prevents Trump from releasing the documents.