This [releasing their taxes] will give us a real sense of whether these people are on the up and up and whether they've been telling us things about themselves that are true or not," Romney said. "Frankly, I think we have good reason to believe that there’s a bombshell in Donald Trump’s taxes."
“What do you mean?” Cavuto asked.
"I think there's something there," Romney said. "Either he's not anywhere near as wealthy as he says he is or he hasn’t been paying the kind of taxes we would expect him to pay, or perhaps he hasn’t been giving money to the vets or to the disabled like he’s been telling us he’s been doing, and the reason that I think there's a bombshell in there is because every time he’s asked about his taxes he dodges and delays and says, well, we're working on it."