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Charles Dharapak, Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney is reflected in a mirror as he campaigns at the Nashua Chamber of Commerce Breakfast in Nashua, N.H., Monday, Jan. 9, 2012.

NASHUA, N.H. — Mitt Romney says he likes being able to "fire people" who don't provide adequate business services.

The Republican presidential candidate also is defending his business background as rivals step up their attacks.

Romney told a Nashua Chamber of Commerce breakfast on Monday that he wants to allow people to shop for their own health insurance instead of just receiving it from their employers. He says that would allow them to fire their health insurer if they aren't happy with it.

Romney, who made millions working as a venture capitalist, is facing criticism from Newt Gingrich, Rick Perry and other rivals over his tenure at Bain Capital.

On Sunday, Romney said he worried about being "pink slipped," though his campaign could not provide an example of when he feared getting fired.