A deal to resolve a U.S. regulator’s claims against Goldman Sachs Group Inc over mortgage-backed securities sold to Fannie Mae and Freddie Mac leading up to the financial crisis could cost the bank between $800 million and $1.25 billion, according to a person familiar with the matter. The person said Goldman Sachs is discussing a settlement with the Federal Housing Finance Agency (FHFA), which filed 18 lawsuits against Goldman and other banks in 2011 over about $200 billion in mortgage-backed securities that later went sour. Goldman Sachs and the FHFA declined to comment on Saturday.