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Lawmakers and some administration officials have since questioned the agency’s secretive process, its credibility and the competence of its analysts, claiming to have found an error in its debt calculations.
In the mortgage inquiry, the Justice Department has been asking about instances in which the company’s analysts wanted to award lower ratings on mortgage bonds but may have been overruled by other S.& P. business managers, according to the people with knowledge of the interviews. If the government finds enough evidence to support such a case, which is likely to be a civil case, it could undercut S.& P.’s longstanding claim that its analysts act independently from business concerns.