WASHINGTON — The regulator for Fannie Mae and Freddie Mac released proposed requirements for the mortgage companies to provide liquidity to underserved housing markets.

Under the proposed rule, each company would have to present a plan to serve such markets. Their regulator, the Federal Housing Finance Agency, would then rate their performance against the plans.

The proposed rule, announced Tuesday, was required by a 2008 housing law. There will be a 45-day period for FHFA to collect public comments before finalizing the rule.

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