Standard & Poor's today affirmed its 'AAA'/'A-1+' senior unsecured debt ratings on Fannie Mae and Freddie Mac.

The agency also announced that it has also placed its  'AA-' risk-to-the-government, subordinated debt, and preferred stock ratings on Freddie Mac, and its 'AA-' subordinated debt and preferred stock ratings, and 'A+' risk-to-the-government rating on Fannie Mae on CreditWatch Negative.

"The affirmation of the senior unsecured debt ratings reflects the strong explicit and implicit support these GSE securities hold in the marketplace," said S&P's credit analyst Victoria Wagner.

According to an S&P release, the most recent public demonstrations of government support by the U.S. Treasury highlight the key public policy and liquidity roles both agencies have in the the country's mortgage markets. S&P added that this is shown in the current stable outlook on the senior unsecured debt.

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