A Senate hearing Tuesday is expected to highlight a long-running, closed-door battle between regulators over the strength of the Volcker Rule.

Senate Banking Committee members are expected to ask their two witnesses — Gary Gensler, chairman of the Commodity Futures Trading Commission and Mary Schapiro, chairman of the Securities and Exchange Commission — about the headline-making trading losses at JPMorgan Chase, but the Volcker Rule's ban on proprietary trading is also likely to be a hot topic.

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