U.S. Rep. Kathy Castor, the only Florida member on the tax conference committee, will have little say in the final product but the Democrat is making her concerns known, from an elimination of a deduction for student loan interest to tax credits for affordable housing.

"It would be better to start over and return to the drawing board because the framework is riddled with special carve outs and uneven treatment," Castor writes in a letter to Rep. Kevin Brady, chairman of Ways & Means.

"The GOP tax framework shows that for many of my colleagues, the hard-earned wages of everyday Americans are not as highly valued as investment income or corporate profits. Such policy changes will eat away at the middle class, and therefore America's economic strength."

Read Castor's letter here.