WASHINGTON -- President Obama said Saturday that current financial rules exploit consumers and he put critics of his proposed overhaul on notice: "While I'm not spoiling for a fight, I'm ready for one."

Obama used his weekly radio and Internet address to defend his recent proposal, which is intended to prevent a repeat of the breakdown that has sent the U.S. economy reeling. But such major changes face a fight in Congress and opposition from some leaders in the banking and insurance industries.

In the address, Obama focused on a consumer watchdog office that he wants to set up.

"This is essential," Obama said. "For this crisis may have started on Wall Street. But its impacts have been felt by ordinary Americans who rely on credit cards, home loans and other financial instruments."

The Consumer Financial Protection Agency would take over oversight of mortgages, requiring that lenders give customers the option of plans with clear and affordable terms.

"It will have the power to set tough new rules so that companies compete by offering innovative products that consumers actually want and actually understand," Obama said. "Those ridiculous contracts -- pages of fine print that no one can figure out -- will be a thing of the past. You'll be able to compare products, with descriptions in plain language, to see what is best for you."

"I welcome a debate about how we can make sure our regulations work for businesses and consumers," Obama said. "But what I will not accept -- what I will vigorously oppose -- are those who do not argue in good faith."

By that, Obama said, he meant those who defend the status quo at any cost. He didn't name any people or organizations, but said special interests are already mobilizing to fight change. He called that typical Washington.

"These are the interests that have benefited from a system which allowed ordinary Americans to be exploited," Obama said. The president said he would stand up for his plans, saying: "While I'm not spoiling for a fight, I'm ready for one. The most important thing we can do to put this era of irresponsibility in the past is to take responsibility now."

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