Sen. Elizabeth Warren (D-Mass.) spoke on the five-year anniversary of the financial crisis, saying Congress should act to end “too big to fail” financial institutions.

“There are many who say, sure, ‘too big to fail’ isn’t over yet, but Congress should wait to act further because the agencies still have to issue a bunch of Dodd-Frank’s required rules,’” Warren said, according to her prepared remarks. “True, there are rules left to be written, but that’s because the agencies have missed more than 60 percent of Dodd-Frank’s rulemaking deadlines.”

Warren touted the new Glass-Steagall Act as a potential solution, and said she doesn’t understand “the logic” in Congress waiting to step in and stop unfair advantages to large banks over their smaller peers.

“I don’t understand the logic,” she said. “Since when does Congress set deadlines, watch regulators miss most of them, and then take that failure as a reason not to act? I thought that if the regulators failed, it was time for Congress to step in. That’s what oversight means. And that’s certainly a principle that would have served our country well prior to the crisis.”

Warren argued “Congress must act” if regulators won’t end “too big to fail.”

“So what I want to know is this: how much longer should Congress wait for regulators to fix this problem? Another three months? Another three years? Until the next big bank comes crashing down?” Warren said.