Using different styles and tactics, Jamie Dimon of JPMorgan Chase & Co. and Vikram Pandit of Citigroup Inc. are making the same argument: policymakers have already done enough to rein in risk-taking. Doing more, particularly tacking on a capital surcharge for the largest firms, the CEOs insist, will crimp credit and in turn chill economic growth.

Dimon, living up to his brash image, has declared the Basel III international capital rules "anti-American," and urged U.S. policymakers to abandon the standards.

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