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MINNEAPOLIS - Vice President Joe Biden is defending the Obama administration's efforts to reform Wall Street - and comparing Republican critics of the law to "squealing pigs."

Biden told a raucous crowd in downtown Minneapolis on Tuesday that Congress had passed a law reining in Wall Street despite objections from presidential candidate Mitt Romney and other Republicans.

Biden described the objections of Republicans as sounding like "squealing pigs" and called the changes "some of the toughest Wall Street regulations in history."

Biden caused a stir last week when he said Romney and other Republicans would put Americans "back in chains" in order to unshackle Wall Street.