Mitt Romney says he'll release his tax 2010 tax returns and 2011 tax estimates Tuesday and says it was a mistake for his presidential campaign to hold off as long as it did in getting them out.

He says the attention paid to the issue had become a distraction for his campaign and he's acknowledging it wasn't the best of weeks for him.

Romney, who lost to Newt Gingrich in Saturday's South Carolina GOP primary, says he wants to shift the focus back to the main campaign issues and hopes that releasing his returns will help do that.

The former Massachusetts governor and venture capitalist tells "Fox News Sunday" that he pays his full and fair share of taxes and he says that what he pays is a substantial amount.