Transcript for Elizabeth Warren's Assault on Wall Street
fire brand is back in the news with a big alert for middle class Americans. The bed rock of the nation. It is now more than 5 1/2 years since the recession began and Massachusetts senator has a bold claim that Wall Street bankers with a disproportionate share of the money because the system is still rigged. As you know, we have been reporting on the fight to save the middle class for years on "World news." Tonight the woman on the frontlines not worried about who she's up setting in her newest roll Reporter: It's long been part of the American dream. Families, with enough money, enough stability, to secure their spot in America's cherished middle class. A lot has changed. Yeah. She is now a senator and not worried about being a Washington insider. The game is rigged to work for those who already have money and power. Working families, they're not looking for a handout. They just want a level playing field. Reporter: A new study shows the rich in this country getting richer since the recession. The top 1% taking in 22% of income in this country. She knows those families slipping because growing up in Oklahoma, hers was one of them. You write my mother usually picked me up from school in our station wagon. She writes she showed up in the Studebaker that dad drove. As she climbed into the car, she asked where the station wagon was. And she said? She said, it's gone. And I just didn't understand. I said, gone where? And she said it's gone. And I remember her hands on the steering wheel getting tighter and tighter. Reporter: Her father had a heart attack. Her mother at 50 getting her first job. A telephone operator at sears. Saving the house but not the car. Those early fears to create the consumer protection bureau to protect family from the big banks. On the eve of her new book, she's revealing with president Obama after learning her brain child. Reporter: Most people you would assume would be members of the other party. You wanted to leave the agency. I never made any secret out of the fact that I would have loved to have stayed. The big banks had said from the very beginning they would kill this agency. Reporter: And the president said it's because you make them nervous. That's right. Did you buy it? I think I did make them nervous. Probably still do. Reporter: She did leave the agency. Instead, she ran for senate and won. This was her first appearance before the banking committee. What I would like to know is tell me a bit about the last few times you have taken the biggest financial institutions on walls street all the way to a trial. I will have to get back to you with the specific information. Reporter: I read a number of articles in the last week. One of them is titled "Hillary's nightmare" and they're talking about you. You know, I don't get who writes these headlines or what I think there's a pundant world out there. Are you going to run for president? I'm not running for president. Nothing that could change your mind? Like I said, I'm not running for president. Do you think Hillary Clinton would make a good president? I think Hillary Clinton is terrific. We have got to stay focus on issues right now. Reporter: At the depth of the recession, 25% of families say they couldn't break into the middle class. Tonight that number up to 40%. She says she's not running for president but clearly campaigning for the middle class tonight. Now we turn to a health
This transcript has been automatically generated and may not be 100% accurate.