Quicken Loans filed a lawsuit late Friday against the U.S. departments of Justice and Housing and Urban Development.

The suit comes in response to an investigation by the government into Quicken's Federal Housing Administration mortgage origination business. According to the lender, the Justice Department has obtained more than 85,000 documents from Quicken and now threatens its own lawsuit, "based on faulty analysis of a miniscule number of cherry-picked mortgages from the nearly 250,000 FHA loans the company has closed since 2007," the Detroit-based company said.

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