WASHINGTON — The Consumer Financial Protection Bureau said Thursday it was seeking additional comments on a long-awaited rule defining a "qualified mortgage," pushing back the expected release date by six months.

Agency officials have repeatedly said the final rule, which would require mortgage lenders to verify a borrower's ability to repay, would be issued by the end of June. On Thursday, however, the agency issued a request for comment on new loan data it has obtained from the Federal Housing Finance Agency, and said it now expects to issue a final rule "before the end of 2012."

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