Mark Cuban wants Trump supporters to tell him what startups their man has backed that didn't involve a member of the Trump family

• Donald Trump doesn't invest in non-family enterprises, said "Shark Tank" star Mark Cuban.
• This, Cuban says, is a reflection of Trump's character.

Billionaire investor Mark Cuban has a question he wants people voting for former President Donald Trump to answer — and a point to prove about it.

"For all Trump supporters. A question. Which startups has Donald Trump ever invested in that didn't involve a family member?" the "Shark Tank" star wrote in an X post on Sunday.

Trump didn't seem to have any investments in non-family enterprises, Cuban later said in an exchange with another X user called Chart Westcott.

This lack of investment, Cuban said, was a reflection of Trump's character.

"You invest in businesses. Right? How many super wealthy business people do you know that have never decided to give even one entrepreneur a shot by investing in their business?" Cuban wrote in a post to Westcott.

"Don't you have a desire to give back to others? To help startups as a way of helping others achieve their American Dream?" Cuban wrote in a subsequent post.

"Every wealthy person I know, except for DJT, has tried to help others."

When approached for comment, a spokesperson for the Trump campaign cited Trump's track record as a property mogul.

"President Trump is a self-made successful businessman who helped build and forever change New York's iconic skyline," the spokesperson said in a statement to Business Insider.

"His other ventures also include creating and starring in one of the most watched television shows in history — much more successful than Shark Tank — and then becoming the 45th President of the United States," the spokesperson continued.

Prior to entering politics, Trump was both the host and co-producer of the NBC reality television series, "The Apprentice" from 2004 to 2015.

NBC would later part ways with Trump in June 2015 over his comments about Mexican immigrants during his first presidential campaign.

This isn't the first time Cuban has criticized Trump's record as a businessman.

Cuban, who said he's backing Vice President Kamala Harris this November, compared Trump to a "snake oil salesperson" during an interview with Axios earlier this year.

"I don't want a snake oil salesperson as president. I'm voting for Biden/Harris over Trump all day every day," Cuban told the outlet in a story published in March.

"Trump voters are happy with their snake oil whether it works or not," Cuban added.

Representatives for Cuban didn't immediately respond to a request for comment sent outside regular business hours.