Why Trump's Call for a Special Prosecutor Is Different

Donald Trump promised at the presidential debate Sunday night that, if elected, he would appoint a special prosecutor to investigate Hillary Clinton's use of a private email server.

"If I win, I am going to instruct my attorney general to get a special prosecutor to look into your situation because there has never been so many lies, so much deception," he said, repeating a vow he first made at the presidential debate Sept. 26.