Senator Joseph Lieberman, the head of a panel investigating Enron's collapse, has called for Standard & Poor's and Moody's Investors Service to be regulated by the Securities and Exchange Commission.
Lieberman said: "We have got to look seriously at creating some kind of system of accountability and monitoring of what the agencies are doing."
Senate and house lawmakers are reportedly questioning the agencies' performance after they rated Enron as an investment-grade company until just four days before its collapse.
Lieberman led a hearing yesterday on how the credit rating agencies dealt with Enron's collapse. Managing directors from S&P, Moody's and Fitch will appear before the Senate Government Affairs Committee.
