The Royal Bank of Scotland may face having to pay a potential settlement of $13 billion amid claims that it sold faulty MBS to Fannie Mae and Freddie Mac, according to court documents. RBS was part of a string of litigation initiated in 2011 by the Federal Housing Finance Agency against 18 financial institutions. The suits alleged violations of federal securities laws and state laws in the sale of the non-agency MBS between 2005 and 2007. “MBS volumes linked...