The events of September 11, 2001, ushered in a new age of anxiety regarding the vulnerability of U.S. national security and the need to bolster our intelligence capacities. This month President Obama added fourteen countries to the terror watch list in response to tremendous concern over the attempted Christmas day bombing of a Detroit-bound flight by an al Qaeda-linked Nigerian national. Certainly, terrorism remains a perilous and pervasive global threat. National security expert Governor Tom Ridge, who served as first secretary of the U.S. Department of Homeland Security, spoke with Governor James R. Thompson on America’s security strategy for the 21st century. They discussed the greatest risks to global security and how our intelligence agencies can effectively combat terrorism and thwart future attacks, and how President Obama might balance the imperatives of promoting our national security while preserving constitutional liberties.