Meanwhile, Senator Elizabeth Warren formally launched her presidential run Saturday with a rally in the working-class city of Lawrence, Massachusetts. Warren, one of the most liberal members of the Senate, is a former Harvard professor whose work trying to rein in Wall Street led to the creation of the Consumer Financial Protection Bureau. In her speech, Warren pledged not to accept any lobbying or super PAC money, challenging other Democrats running in the primary to do the same. Warren then traveled to Iowa on Sunday.

Sen. Elizabeth Warren: “By the time we get to 2020, Donald Trump may not even be president. In fact, he may not even be a free person.”

Warren came under fire last year for taking a DNA test to demonstrate her Native American ancestry. She later apologized for the move. Last week, The Washington Post reported that she listed herself as “American Indian” on a 1986 Texas legal bar registration form. In response to the backlash, Warren said, “I can’t go back. … But I am sorry for furthering confusion on tribal sovereignty and tribal citizenship and harm that resulted.”