Two lawmakers from opposite sides of the political spectrum mailed a letter to Federal Reserve Chairman Ben Bernanke, asking the Fed chair to force the nation's big banks to hold more capital, Bloomberg-Businessweek reported.

The letter was signed by David Vitter, R-La., and Sherrod Brown, D-Ohio.

In their letter to Bernanke, the senators called today's proposed standards for dealing with systemically risky banks "a baby step in the right direction," according to Bloomberg.

"You must have the board revisit the proposed rule to implement Basel III and modify the rule to include a SIFI surcharge significant enough to change the incentives for the largest banks," the senators wrote.

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