Community, consumer groups call for delay to banking merger

A deal of such a size should not be subject to just 30 days of public comment, but rather should be open to public input for at least 90 days, the groups said.

Extending the review timeline will also allow regulators to review the deal and make sure it meets all new requirements under the Dodd-Frank financial reform law, and also allow the newly authorized Consumer Financial Protection Bureau to review the two banks for any potential problems with their consumer credit card practices.

The groups also point out that the National Community Reinvestment Coalition, which signed on to the letter, has filed a complaint against Capital One, charging that the bank violated fair lending laws. The U.S. Department of Housing and Urban Development is currently investigating the claim.