A federal judge on Monday indicated he plans to dismiss National Credit Union Administration (NCUA)’s suit against RBS Securities for the sale of failed MBS to WesCorp Federal Credit Union, a ruling that potentially jeopardizes all of NCUA’s claims against Wall Street banks for the failure of the five corporate credit unions.

U.S. Judge George Wu told NCUA he was not convinced by additional arguments since his Dec. 19 temporary ruling that the credit union regulator failed to prove that RBS misled WesCorp about the riskiness of some $1.2 billion of MBS it sold to the one-time $34-billion corporate credit union.

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