By Ryan Tracy 

WASHINGTON--Lawmakers from both parties pressed U.S. regulators to continue efforts to shrink or lessen the risk big banks pose to the financial system, signaling support for recent moves to impose new constraints on Wall Street.

The support for a big-bank regulatory crackdown was underscored at a Senate Banking Committee hearing Tuesday as lawmakers drew a distinction between large banks and other financial firms. Several senators pushed regulators to ease burdens on insurance companies and small and midsize banks while backing additional regulatory action to ensure the biggest banks aren't "too big to fail."

Unless regulators "are willing to take the steps necessary to make sure that these organizations are not too complex to be resolved through bankruptcy, than all is for naught," said Sen. Bob Corker (R., Tenn.).

Mr. Corker was referring to the Federal Reserve and the Federal Deposit Insurance Corp.'s recent rejection of big banks' plans to avoid a taxpayer bailout if they run into financial trouble. Regulators' strong words on that issue last month surprised Wall Street. Under questioning from Mr. Corker and others, regulatory officials reiterated they are prepared to use the 2010 Dodd-Frank law to force firms to simplify their structures if they are unable to fix flaws in their plans.

Sen. Sherrod Brown (D., Ohio) praised Fed Gov. Daniel Tarullo Tuesday for promising to raise capital requirements above international levels for the very largest U.S. banks.

"There's a great deal of support in this committee and I think throughout the House and Senate on stronger capital standards like that, " Mr. Brown said.

The standards could force big U.S. banks to retain additional earnings in order to build the capital they use to fund lending, rather than distributing those earnings to shareholders. Alternatively, banks could pull back from certain short-term funding markets, including repurchase agreements, that will be discouraged under the new rules. Analysts said Tuesday some banks' stock prices could face downward pressure as a result of the Fed move.

"No matter when we think Basel's done there's another round to it," said Bank of New York Mellon Corp. Chief Executive Gerald Hassell at a conference in New York Tuesday, referring to the agreements on bank capital levels negotiated in Basel, Switzerland. The Fed is changing those rules to include the higher U.S. requirement.

However, Mr. Hassell said he didn't see a major effect on his bank: "Our capital ratios are extremely strong. I think we're in good shape."

While Washington continues to impose additional requirements for the biggest firms, Mr. Tarullo said "it may be time" for Congress to exempt small and medium-size banks from certain aspects of the 2010 Dodd-Frank financial law. He said some banks with more than $50 billion in assets probably shouldn't be subject to the Fed's annual "stress tests" of their ability to weather a recession.

Mr. Tarullo also reiterated the Fed's desire to have Congress change the Dodd-Frank law to give it more flexibility in writing rules for some of the biggest U.S. insurance companies. A bill to that effect has passed the Senate but stalled in the House. Mr. Tarullo said Fed staff are working simultaneously on two versions of the rule: One if Congress acts, and one if it doesn't.

"In the absence of the legislation, we would still be able to do some things" to tailor rules to insurance companies, he told the lawmakers. He said some insurance products don't resemble banking products and therefore wouldn't have to be subject to banklike capital standards.

The Senators' frustrations with Wall Street banks were laid bare near the end of the hearing, when Sen. Elizabeth Warren (D., Mass.) asked regulators why they hadn't held individual bankers accountable for actions that led to the financial crisis despite the multibillion-dollar settlements announced in recent months related to those misdeeds.

"Without criminal prosecutions, the message for every Wall Street banker is loud and clear. If you break the law, you are not going to jail, but you might end up with a much bigger paycheck," Ms. Warren said.

Sen. Richard Shelby (R., Ala.), who could take the gavel of the committee should Republicans retake the Senate in the November elections, said he agreed with Ms. Warren's outrage over the lack of jail time for bankers--a noteworthy statement since the two don't often agree on policy.

No one in the financial sector or elsewhere should be "able to buy their way out from culpability when it's so strong it defies rationality--I agree with her on that," Mr. Shelby said.

Mr. Tarullo said regulators have asked firms to fire employees who did wrong and have "shared all the information that the Department of Justice needed" if it were going to pursue prosecutions.

A Justice Department representative didn't respond to a request for comment.

Victoria McGrane and Saabira Chaudhuri contribute to this article

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