WALTER: When we look at these issues, and we truly believe that we had a very vigorous enforcement program. We’d look at the distinction between what we can get if we go to trial and what we’d get if we don’t. WARREN: I appreciate that, that’s what everybody does. So, the question I’m really asking is, can you identify when you last took the Wall Street banks to trial? WALTER: I will have to get back to you with the specific information.

Sen. Elizabeth Warren questions why regulators had not prosecuted a bank since the financial crisis.