Should Wells Fargo CEO resign over scandal?

Wells Fargo CEO John Stumpf was grilled by members of the US Senate banking committee this week. Both Republican and Democratic senators including Elizabeth Warren tore into him over the scandal in which Wells Fargo employees opened approx. 2 million checking and credit accounts without customers' knowledge or consent. As Business Insider writes: "Millions of people in the US have had to get a credit check for a mortgage, so when senators suggest that Wells Fargo employees opening and closing a credit card without a customer's knowledge may affect a credit score and lead to a higher interest rate, it's simple to understand the direct ramification."

What do you think? Should Stumpf resign over the scandal?