The Senate Homeland Security and Government Affairs Committee reflected on today’s national security challenges during a recent hearing titled “18 Years Later: The state of Homeland Security After 9/11.”  Chertoff Group Executive Chairman Michael Chertoff, who served as the second U.S. Homeland Security Secretary, testified about the collective work done to prevent this type of event from occurring again and where further investment and attention is needed to protect the safety and security of the American people.