The federal government has put up what a regulator said was a total of about $1 trillion to prop up Fannie Mae and Freddie Mac through capital infusions and purchases of their corporate debt and MBS since the two mortgage giants were placed in conservatorships last September.

The Federal Reserve and the Treasury Department have purchased $843 billion in Fannie and Freddie MBS to lower mortgage rates and support the secondary mortgage market and $105 billion in GSE debt, according to the Federal Housing Finance Agency (FHFA).

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