 Secret Service Director Kimberly Cheadle will appear before Congress on Monday. And at the same time, security preparations are underway for the Democratic National Convention next month. CBS News Chicago reporter Charlie DeMar is there. Dr. David Rottinghaus says his staff coordinated with the Secret Service well in advance of the rally. It was surreal. You know, you prepare for things like this. You don't necessarily prepare to receive a president or former president.