Fitch: US Risks 2013 Rating Downgrade Without 'Credible' Deficit Plan

It also said it would immediately cut the credit ratings on Cyprus, Ireland, Italy, Spain and Portugal if Greece were to exit the eurozone. Additionally, all eurozone nations would have their ratings put on its negative ratings watch list, setting a six-month time frame for a potential downgrade.

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"The United States is the only country (of four major AAA-rated countries) which does not have a credible fiscal consolidation plan," and its debt-to-GDP ratio, or how much debt it has relative to the size of the economy, is expected to increase over the medium term, Ed Parker, sovereign ratings analyst, told a Fitch conference in New York.