Sen. Scott Brown, a key vote considered necessary to pass regulatory reform, said Tuesday he would not support the final bill unless a provision to tax banks is removed from the legislation.

"I am writing you to express my strong opposition to the $19 billion bank tax that was included in the financial reform bill during the conference committee," Brown wrote in a letter to House Financial Services Committee Chairman Barney Frank and Senate Banking Committee Chairman Chris Dodd. "This tax was not in the Senate version of the bill, which I supported. If the final version of this bill contains these higher taxes, I will not support it."

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