Senators during a hearing asked Commodity Futures Trading Commission Chairman Gary Gensler and Securities and Exchange Commission Chairman Mary Jo White tough questions about the regulators' divergent paths on cross-border rules. One senator suggested the agencies could again face discussion about being merged. "If the current lack of coordination persists, it would not be surprising to me to hear additional calls for merging the two agencies into a single regulator for the securities, futures and swaps markets," said Sen. Mike Crapo, R-Idaho.

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