panelists include university of california irvine law school dean irwin shimarinski and former u.s. solicitor general paul clement. last week president obama nominated elena kagan to replace justin john paul stevens who's retiring at the end of the term. "america and the courts" today at 7:00 p.m. eastern on c span. >> this week on the communicators, a discussion on cyber security with phillip ridinger of the department of homeland security. >> phillip ridinger, what are your duties as undersecretary of national protection at the department of homeland security? >> so my duties fall into sort of three categories. first i'm the deputy undersecretary for the national protection and programs director, which means i'm the number two in a fairly large organization that is bigger than just cyber. so within mppd or the national protection programs director is also infrastructure protection which is all about protecting the country's infrastructure, physical infrastructure and otherwise, the federal protective service which is responsible for protecting government buildings, risk management