In 2009 alone, U.S. authorities foiled at least six terrorist plots against the United States. Since September 11, 2001, at least 30 planned terrorist attacks have been foiled, all but two of them prevented by law enforcement. The two notable exceptions are the passengers and flight attendants who subdued the "shoe bomber" in 2001 and the "underwear bomber" on Christmas Day in 2009. Bottom line: The system has generally worked well. But many tools necessary for ferreting out conspiracies and catching terrorists are under attack. Chief among them are key provisions of the PATRIOT Act that are set to expire at the end of this year. It is time for President Obama to demonstrate his commitment to keeping the country safe. Heritage Foundation national security experts provide a road map for a successful counterterrorism strategy.