Carl Pascarella, president and chief executive officer of Visa U.S.A., strained at the leash Thursday to hit back at the Department of Justice.

In Chicago to address a small-business banking conference sponsored by American Banker and Robert Morris Associates, Mr. Pascarella said he was advised by lawyers not to say too much about the antitrust suit filed Wednesday against Visa U.S.A. and MasterCard International.

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