The punches from Mark Cuban keep on coming.

On Sunday, the Dallas Mavericks owner tweeted a link to a column he wrote in 2011 titled "Get rich, pay taxes: It's a patriotic duty" -- a dig aimed at Donald Trump following revelations that a $916 million loss in 1995 may have allowed him to legally dodge federal income taxes for nearly two decades.

Cuban's column was originally posted on his blog and then published in The Guardian in September 2011. He wrote that while some people find it "distasteful" to pay taxes, he finds it patriotic.

"So be patriotic," he wrote. "Go out there and get rich. Get so obnoxiously rich that when that tax bill comes, your first thought will be to choke on how big a check you have to write. Your second thought will be 'what a great problem to have,' and your third should be a recognition that in paying your taxes you are helping to support millions of Americans that are not as fortunate as you."

Breaking with political tradition in presidential campaigns, Trump has not released copies of his federal tax returns.

Donald Trump Jr. told the Pittsburgh Tribune-Review this month that his father hadn't released his tax returns "because he's got a 12,000-page tax return that would create ... financial auditors out of every person in the country asking questions that would distract from (his father's) main message."

Meanwhile, the elder Trump told the audience at the kick-off presidential debate last week that he had not shared his tax filings because he was being audited by the Internal Revenue Service.

In one of the most notable moments of the debate, Clinton accused Trump of not paying federal income taxes, and he fired back: "That makes me smart."

Cuban, a guest of Clinton at the debate, criticized Trump over the comment. (The two billionaires have their own feud going on.)

He told reporters that he tells his tax lawyers to "take advantage -- do what the law recommends," but that he's not against paying taxes.

"At some point you have to recognize you have to give back and you have to realize that this is a country that has been great to us," Cuban said, "and you can't just take, take, take, take, take, take, take."

.@mcuban on Trump saying not paying taxes makes him smart #debatenight pic.twitter.com/uPNunatukV — Stefan Becket (@becket) September 27, 2016

Trump tax records obtained by The New York Times show he declared a loss of $916 million in 1995. But tax rules benefiting wealthy filers would have allowed the Republican nominee to cancel out up to $50 million in taxable income per year for up to 18 years, according to the newspaper.

The Trump campaign threatened The Times with legal action but has neither confirmed nor contested the legitimacy of the records.

I know our complex tax laws better than anyone who has ever run for president and am the only one who can fix them. #failing@nytimes — Donald J. Trump (@realDonaldTrump) October 2, 2016

Cuban tweeted that "it's hard to lose $1b."

Six years ago, Cuban volunteered to write a $100,000 check to help the city of Dallas with a budget shortfall and even supported a tax hike for wealthy homeowners like him. He told The Dallas Morning News he'd be OK raising the city tax rate by 5 cents "if it were only applied to homes valued at [$5 million] or more. And I would also be open to making a voluntary contribution of $100k...." At the time, Cuban's Preston Hollow home was valued at more than $14 million.

Earlier this year, he pledged $1 million for the Dallas Police Department after the Orlando shooting. Mayor Mike Rawlings said the money would help pay for increased police presence in Dallas' Oak Lawn neighborhood and other counterterrorism efforts.

Because Trump has not released his tax returns, the extent of his charitable giving is unclear.

Still, The Washington Post has identified $3.9 million in Trump donations to charity since 2001, compared to $23.2 million given by the Clintons in the same time period. The Clinton figure was calculated using the couple's tax returns, according to The Post.

Two prominent Trump supporters on Sunday defended his possible use of the tax code to avoid paying federal income tax. In Sunday TV shows, New Jersey Gov. Chris Christie and former New York Mayor Rudy Giuliani used the same word to describe him: "genius."