GOP presidential hopeful Rick Perry is ratcheting up the attacks on Mitt Romney, calling his rival a "fat cat" and urging him to make public his tax returns.

Romney spokeswoman Andrea Saul said the candidate will "take a look at the question of releasing tax returns during the next tax filing season."

She said Perry's campaign shouldn't "lecture anyone on disclosure," arguing that the Texan is not fully telling the public about his taxpayer-funded travel.

Perry regularly makes public his income tax returns, going back to the 1980s. He and his wife, Anita, paid $51,000 in federal taxes in 2010 on adjusted gross income of $217,447, according to a report in the Fort Worth Star-Telegram.