Administration officials say the risk of angering the new government in Pakistan and stirring increased anti-American sentiment in the tribal areas outweighs the benefits of dismantling militant networks in the region.

“It’s certainly something we want to get to, but not yet,” said one Bush administration official. “If you do it now, you can expect to do it without Pakistani approval, and you can expect to do it only once because the Pakistanis will never help us again.”

Spokesmen for the White House and State Department declined to comment, as did a spokeswoman for Ambassador Patterson in Pakistan.

Intelligence officials say they believe that leaders of the Pakistani Taliban and other militant groups have in recent months forged closer ties to the cadre of Qaeda leaders in the tribal areas. Officials have said that they thought the leader of the Taliban there, Jalaluddin Haqqani, may have died last year. But Mr. Haqqani recently released a video denying those reports and made reference to a military attack in eastern Afghanistan that happened this March. Mr. Haqqani’s son, Sirajuddin, has also made aggressive efforts to recruit foreign fighters from the Persian Gulf and elsewhere in Central Asia.

“The relationship between the Taliban and Al Qaeda, and Al Qaeda and other groups such as the Haqqani network, are stronger today than they were, and they’re primarily based on the Pakistani side of the border,” said Seth Jones, an analyst with the RAND Corporation, in Congressional testimony this month after his trip to Afghanistan.

The Haqqanis are suspected of organizing a suicide attack on March 3 that killed two American soldiers at an Afghan government office. Sirajuddin Haqqani is also suspected of orchestrating a suicide bomb attack in January at the Serena Hotel in Kabul that killed six people.

The discussions over how to combat Al Qaeda and Pakistani militant networks in the tribal areas have been going on for nearly two years, as American policy makers have weighed the growing militant threat in the border area against unilateral American action that could politically weaken President Pervez Musharraf, a close ally in the global counterterrorism campaign.