"My response is if you want to question my qualifications, then maybe the American people might wonder about your qualifications Madame Secretary," he said.

Sanders added: "When you voted for the war in Iraq, the most disastrous foreign policy blunder in the history of America, you might want to question your qualifications. When you voted for trade agreements that cost millions of Americans decent paying jobs, and the American people might want to wonder about your qualifications. When you're spending an enormous amount of time raising money for your super PAC from some of the wealthiest people in this country, and from some of the most outrageous special interests ... Are you qualified to be president of the United States when you're raising millions of dollars from Wall Street whose greed and recklessness helped destroy our economy?"