NASHVILLE, Tennessee (Reuters) - Republican U.S. presidential candidate John McCain on Tuesday said that if elected president he would order the Treasury Department to buy bad home mortgages and renegotiate them to help homeowners in trouble.

During their second presidential debate, McCain's rival for the White House, Democrat Barack Obama, said that billionaire investor Warren Buffett would be a "pretty good choice" for U.S. Treasury Secretary, while McCain said, "I like Meg Whitman" for that post, referring to the former CEO of online auction company eBay.

(Reporting by Richard Cowan, Editing by Frances Kerry)

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