Billionaires in Twitter Fight Over Trump

"You know you wouldn't hire @realDonaldTrump unless you were short the company," Cuban tweeted at Icahn, a prominent Trump backer. 

Investors "short" a stock when they think it will collapse. Cuban could have been alluding to the 90% loss that people who invested in Trump's casino company "DJT" took when it filed for bankruptcy in 2004.

cahn is so worried about overregulation and a lack of business investment that last week he warned the U.S. economy will tank if Trump loses. 

Cuban, star of ABC's "Shark Tank," tweeted at Icahn on Monday morning, noting that if Icahn was so concerned about regulation, how come it hasn't stopped him from investing in energy companies, which are heavily regulated. 

Cuban wrote: "Regs can improve, no doubt, but trump plan is a disaster." 

Icahn countered that regulation has stopped him "and thousands of others from making capital investments."

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