Mark Cuban just called out Donald Trump on Twitter to let him interview him and suggested “what do you have to lose.”

On Friday, the tech billionaire tweeted Trump that he would give the charity of his choice $10 million dollars if he would let him interview him for four hours to talk about his policies. This came after the Republican presidential nominee said on Friday on Fox Business’s “Mornings with Maria” that Cuban was “not smart enough to understand what we are doing” because Cuban said under Trump’s economic plan the “market tanks.” (RELATED: Mark Cuban Highly Doubts Donald Trump Is A Billionaire)

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“.1) $10mm to the charity of your choice if you let me interview you for 4 hrs on your policies and their substance,” Cuban tweeted. (RELATED: Mark Cuban Has A Prediction For Donald Trump’s Mexico Speech. Let’s Hope It Happens [VIDEO])

.1) @realDonaldTrump $10mm to the charity of YOUR choice if you let ME interview you for 4 hrs on YOUR policies and their substance. — Mark Cuban (@mcuban) September 16, 2016

“2) Ground rules are that you can’t mention the Clintons or discuss anything other than the details and facts of your plans,” he added.

2) @realDonaldTrump groundrules are that you cant mention the Clintons or discuss anything other than the details and facts of yr plans and — Mark Cuban (@mcuban) September 16, 2016

“3) And no one else is in the room to help,” he continued. “Just me, you and a broadcast crew. Deal ?”

3) @realDonaldTrump and no one else is in the room to help. Just me, you and a broadcast crew. Deal ? — Mark Cuban (@mcuban) September 16, 2016

“4) I’ll add an option,” he tweeted. “If you need it, I’ll write you the check and you can keep the money rather than give it to charity.”

4)@realDonaldTrump I’ll add an option.If you need it, I’ll write you the check and you can keep the money rather than give it to charity — Mark Cuban (@mcuban) September 16, 2016



“5) In the inmortal words of you,” he added. “What do you have to lose ?”