Answer
The motivation behind why the letter was sent to Congress was to add extra weight on the FASB to defer or drop the issuance of a standard on derivatives. However, in similar cases, when the business network dislikes the appropriate response proposed by the FASB, it resorts to campaigning individuals from Congress. The campaigning endeavors, for the most part, include creating some sort of enactment that will invalidate the standard.
Work Step by Step
Now and again, endeavors include testing the FASB's position to create controls in specific territories with extra Congressional oversight.