Maryfran Johnson and Deborah Radcliff

U.S. cybersecurity czar Richard Clarke said Wednesday that cyberattacks on the nation's critical IT infrastructure could potentially cause "catastrophic damage to the economy" and urged more spending on IT infrastructure and security.

U.S. cybersecurity czar Richard Clarke said Wednesday that cyberattacks on the United States' critical IT infrastructure could potentially cause "catastrophic damage to the economy" and urged more spending on IT infrastructure and security.