The United States believes Pakistan's cooperation remains vital to American national security even as it has issues at times with the key South Asian country, the White House said amid reports of improved counter-terror collaboration between the two sides. "The cooperation we have with Pakistan is extremely important in terms of our national security objectives, in terms of protecting Americans, in terms of taking the fight to al Qaeda, and that's why we continue to work with the Pakistanis and try to build on that cooperation," Jay Carney, President Obama's spokesman said.