The White House says it is clear that al-Qaida and Taleban militants operating in Pakistan's northwest territories and tribal areas are threatening Pakistan's stability.
White House spokesman Tony Snow on Thursday said Pakistani President Pervez Musharraf must aggressively counter the insurgency in those areas.
Snow said General Musharraf's campaign to use tribal leaders to contain the growing militancy has failed, forcing the president to become more aggressive in his use of security forces in the region.
Snow commended General Musharraf for being an important ally in the war against terrorism.
A US government summary released this week (the National Intelligence Estimate) says al-Qaida terrorists have regained strength in safe havens in northwest Pakistan, and that they remain determined to strike the United States.