Since 2004 the US government has reportedly been concerned about the safety of Pakistani nuclear facilities and weapons. Press reports have suggested that the United States has contingency plans to send in special forces to help "secure the Pakistani nuclear arsenal". In 2007, Lisa Curtis of The Heritage Foundation, while giving testimony before the United States House Foreign Affairs Subcommittee on Terrorism, Nonproliferation, and Trade, concluded that "preventing Pakistan's nuclear weapons and technology from falling into the hands of terrorists should be a top priority for the US." However Pakistan's government has ridiculed claims that the weapons are not secure.