Fitch ratings agency warned Tuesday that Britain's top triple-AAA debt rating was on the line

Calling the lower growth forecasts the British government released Tuesday as more realistic and adding credibility to its effort to put public finances on a sustainable path, Fitch warned that Britain is now on course to become the highest indebted AAA-rated country behind the United States.

"The capacity of UK public finances to absorb adverse economic and financial shocks that would result in yet higher public debt while retaining its 'AAA' status has largely been exhausted," Fitch said in a statement.

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