WASHINGTON — Supporters of financial reform, caught off balance by an end-of-the-year push in the Senate to subject a wide range of new regulations to greater scrutiny, are reacting frantically to what they see as a threat to undermine the Dodd-Frank Act.

The source of their anxiety is legislation introduced early last month by Sen. Rob Portman, R-Ohio. The bill has a chance to move quickly to a vote on the Senate floor, although that possibility became more remote Wednesday when a potential committee vote on the measure was delayed until Nov. 15.

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