Sen. Elizabeth WarrenElizabeth WarrenPoll: Clinton up 9 on Trump in NH The Trail 2016: Comeback in the works? The Hill's 12:30 Report MORE (D-Mass.) has been worried for 25 years about the power of the financial services industry, and that's not going away.
On Sunday, Warren reiterated those concerns while promoting her new book, "A Fighting Chance," on ABC's "This Week with George Stephanopoulos."
"And what bothers me now is they still strut around Washington, they block regulations they don't want and roll over agencies whenever they can," Warren added.
She went on to say it will continue to be a central issue for her during her time in the Senate, but wouldn't say if former Secretary of State Hillary Clinton's actions toward banking executives would determine whether or not Warren backs her in 2016.
In her first book, Warren criticized Clinton for the campaign contributions she received from those in the financial services industry.
When questioned on it, however, Warren stood by a letter she sent to Clinton with a number of other Senate Democrats urging the former first lady to make a run for the presidency in 2016.