"When people accuse you of a crime, you have every reason to go after them pretty hard, and I'm going to continue going after him. I'm very proud of the record I had at my business career, helping turn around the Olympics and as the governor of the state of Massachusetts," said Romney on "Fox and Friends."
"What does it say about a president whose record is so poor that all he can do is attack me? I think it's finally time for us to talk about his record," he said.
Romney also drew attention to his campaign's new criticism against Obama, accusing the president of giving special treatment to campaign donors at a time when the middle class is struggling to find jobs and recover from the recession.
"This is a tough time for the people of America, but if you're a campaign contributor to Barack Obama, your business may stand to make, to get billions of dollars or hundreds of millions of dollars in cash from the government. I think it's wrong. I think it stinks to high heaven," Romney said.
He remained defiant about rejecting calls to release more of his tax records, telling Fox News that the Obama team is attempting to find more information to "distort."
"We're going to put out two years of tax returns — put out one already. Soon as the most recent year is complete, we'll put that out. It's hundreds of pages of documents," he said.
Romney was forced to defend his tenure at private-equity firm Bain Capital last week — appearing in five separate television interviews Friday — after the Obama team accused the GOP hopeful of misleading the public about his timeline of leadership at the firm.
He demanded an apology from Obama over the allegations and maintained that he had "no role" in managing Bain after 1999.
Former Obama White House Chief of Staff and current Chicago Mayor Rahm Emanuel told ABC's "This Week" Sunday that since the GOP candidate had made his work at Bain a “calling card” of his campaign, he should “stop whining" about the attacks.