WASHINGTON – U.S. military and intelligence officials are so frustrated with Pakistan's failure to stop local militant groups from attacking Americans in neighboring Afghanistan that they have considered launching secret joint U.S.-Afghan commando raids into Pakistan to hunt them down, officials told The Associated Press.

But the idea, which U.S. officials say comes up every couple of months, has been consistently rejected because the White House believes the chance of successfully rooting out the deadly Haqqani network would not be worth the intense diplomatic blowback from Pakistan that inevitably would ensue.

Members of the Haqqani tribe have been targeted by pilotless U.S. drone aircraft, but sending American and Afghan troops into Pakistan would be a serious escalation of the hunt for terrorists and could potentially be the final straw for Pakistan, which already is angered over what it sees as U.S. violations of its sovereignty.