Alabama's Republican Governor, Robert Bentley, called on Romney to release all the documents requested of him. "If you have things to hide, then maybe you're doing things wrong. I think you ought to be willing to release everything to the American people."
Determined to scramble Democrat campaign messages scrutinising Romney's financial dealings, Republicans have sent up a distracting flare: Condoleezza Rice may join the presidential ticket.
It is the oldest trick to use running-mate suspense to keep supporters titillated and to avert the eyes of the media from more dangerous topics.
The insertion into the mix of the former National Security Adviser and and Secretary of State to President George W. Bush came courtesy of a headline on the conservative blog the Drudge Report and gave the veepstakes some instant vim.
That said, the notion was quickly dismissed by conservatives who voiced their disapproval in droves.
A Condi choice may stack up, not least because she is black and a woman.
But she is pro-choice, anathema to conservatives, remains closely associated with Bush and his foreign policy stumbles, and has no domestic policy record.
Radio host Mark Levin said choosing would be "bad politics". He argued: "Not only will Romney be defending Bain up through the election, now he's going to have to be defending Bush and Bush's policies right up through the election. This is a bad idea. No offence, Condi ."
Katrina Trinko, of the right-leaning National Review, added: "I'm surprised. Both Rice's views on abortion [she has said that she is "mildly pro-choice"] and her years in the Bush Administration seem likely to generate controversy."
- Independent, AP