The Senate Banking Committee is looking into Standard & Poor’s downgrade of U.S. debt, a committee aide said Tuesday. The committee is gathering information on the rating agency’s action, the aide added.

Separately, Rep. Dennis Kucinich, D-Ohio, sent an Aug. 9 letter to Harold McGraw 3d, chairman and chief executive of S&P’s parent, the McGraw-Hill Cos., demanding documentation of the company’s investments, to show there was no conflict of interest spawned by the rating agency’s downgrade.

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