Reiterating its support to Pakistan in the fight against militancy, the US has asked Islamabad to continue doing "everything" to defeat insurgency in the country, which is a threat to their national security."Clearly there are insurgents within Pakistan's border that are a threat to the government itself, and we will continue to work with Pakistan and encourage them to continue to do everything possible to defeat this insurgency, which is a danger to the country and a danger to others," State Department spokesman P J Crowley told reporters at his daily news conference."As we've said here many times, Pakistan has taken considerable action in recent years. No military in the world has suffered more casualties in the fight against terrorism than Pakistan," Crowley said, adding that the US relationship with Pakistan is that of a strategic one.