WASHINGTON — A plan to ban proprietary trading — once considered a long shot — is now almost certain to be enacted as part of a regulatory reform bill, thanks in part to a hearing Tuesday where Goldman Sachs Group Inc. executives came under withering allegations of betting against the firm's own clients.

When President Obama first endorsed the "Volcker Rule" in January, lawmakers were skeptical because many saw it as largely unrelated to the mortgage practices that spurred the crisis.

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