Democratic U.S. Senate candidate Elizabeth Warren's campaign said Tuesday that she misspoke when she said Republican Sen. Scott Brown should release 20 years of tax returns.

Brown's campaign accused Warren of "backpedaling and hypocrisy."

Warren made the comments Monday night at an appearance in Worcester to celebrate the opening of a campaign office.

"I think Scott Brown should release his tax returns for all the years he's been in public service," Warren said according to the website  GoLocalWorcester.com. "He's been in public service for 20 years, then he should have 20 years of tax returns."

Earlier this year, Brown released six years of tax returns. Warren released four.

A Warren spokeswoman said Tuesday that Warren had been asked a question about Republican presidential candidate Mitt Romney, who has been criticized for saying he'd release no more than two years of returns.

The aide said Warren believes Romney should release more years, but believes she and Brown have released enough.