The U.S. government's AAA credit rating remains stable, according to Moody's Investor Service.

However, the agency warned in a statement on Tuesday that America's heavy debt and record spending could pose a risk to that high rating.

"The ratios of general government debt to gross domestic product and to revenue are deteriorating sharply, and after the crisis they are likely to be higher than the ratios of other AAA-rated countries," the agency said.

Over the past three years, America's ratio of debt to revenue has more than doubled - a phenomenon the agency mostly attributes to asset purchases.

Moody's says lawmakers in Washington need to cut enormous budget deficits. Such a move could mean higher taxes, spending cuts, or a combination of both in the years ahead.

In an effort to show he's serious about tackling the nation's deficit, President Obama has appointed a team of outside experts to suggest ways to improve America's fiscal position.