Billionaire Mark Cuban on Tuesday raised new questions about Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s wealth, questioning whether the presumptive GOP presidential nominee has enough cash to fund his campaign.

"If @realDonaldTrump were fractionally as rich as he says he is,he would write a$200mm check to propel his campaign,” Cuban tweeted Tuesday.

If @realDonaldTrump were fractionally as rich as he says he is,he would write a$200mm check to propel his campaign. He doesn't have the cash — Mark Cuban (@mcuban) June 21, 2016

ADVERTISEMENT

Cuban’s jab comes one day after an FEC report revealed Trump’s campaign had just $1.3 million in the bank.

Trump raised just $3.1 million for his campaign in May, compared to the $26.4 million raised by presumptive Democratic presidential nominee Hillary Clinton.

Cuban has previously questioned whether Trump is as rich as he says he is. He's noted that Trump may be good at putting his name on buildings, but not much more.

"He's good at that. Whether or not that's made him a billionaire, I don't know," Cuban said earlier this month. "He's not transparent enough for us to actually know."