 Lankford says it's an attempt to get answers after Saturday's assassination attempt on Donald Trump. I would call it not only a failure from the Secret Service, but I would call it an enormous failure. Yes, we've made major mistakes on this. Now, how do we hold people accountable? How do we make sure this doesn't happen again? Lankford said the Secret Service knew about a suspicious person in the area before the rally began. He believes the director should resign.