WASHINGTON — Lawmakers pressed regulators Thursday about the significance of new capital rules and a separate proposal to raise the leverage ratio on the largest banks, raising fears they could still allow institutions to effectively "game" the system.

Sen. Sherrod Brown, D-Ohio, praised regulators for suggesting an increase in the leverage ratio, but said it did not go far enough, citing media reports that said large institutions plan to use "optimization strategies," instead of more capital, to comply with the new rules.

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