For the time being, officials say, the White House has ruled out unilateral strikes against the training camps that American spy satellites are monitoring in North Waziristan, in Pakistan’s tribal areas on the border. The fear is that such strikes would result in what one administration official referred to as a “shock to the stability” of General Musharraf’s government.  General Musharraf, a savvy survivor in the brutal world of Pakistani politics, knows that the administration is hesitant to push him too far. If his government collapses, it is not clear who would succeed him or who would gain control over Pakistan’s arsenal of nuclear weapons.  But the spread of Al Qaeda in the tribal areas threatens to undermine a central element of Mr. Bush’s argument that he is succeeding in the administration’s effort to curb terrorism. The bomb plot disrupted in Britain last summer, involving plans to hijack airplanes, has been linked by British and American intelligence agencies to camps in the Pakistan-Afghan border areas.  General Musharraf has told American officials that Pakistani military operations in the tribal areas in recent years so alienated local residents that they no longer provide the central government with quality intelligence about the movements of senior Islamic militants.  Congressional Democrats have threatened to review military assistance and other aid to Pakistan unless they see evidence of aggressive attacks on Al Qaeda. The House last month passed a measure linking future military aid to White House certification that Pakistan “is making all possible efforts to prevent the Taliban from operating in areas under its sovereign control.”  Pakistan is now the fifth-largest recipient of American aid. Mr. Bush has proposed $785 million in aid to Pakistan in his new budget, including $300 million in military aid to help Pakistan combat Islamic radicalism in the country.  The rumblings from Congress give Mr. Bush and his top advisers a way of conveying the seriousness of the problem, officials said, without appearing to issue a direct threat to the proud Pakistani leader themselves.  “We think the Pakistani aid is at risk in Congress,” said the senior official, who declined to speak on the record because the subject involved intelligence matters.  The administration has sent a series of emissaries to see the Pakistani leader in recent weeks, including the new secretary of defense, Robert M. Gates. Mr. Gates was charged with prompting more action in a region in which American forces operate with great constraints, if they are allowed in at all.  “This is not the type of relationship where we can order action,” said an administration official involved in discussions over Pakistan policy. “We can strongly encourage.”  Relations between General Musharraf and Mr. Bush have always been tense, as the Pakistani leader veers between his need for American support and protection and his awareness that many Pakistani people — and the intelligence service — have strong sympathies for Al Qaeda and the resurgent Taliban. Officials involved with the issue describe the current moment between the leaders as especially fraught.  Mr. Bush was deeply skeptical of the deal General Musharraf struck with the tribal leaders last year, fearing that it would limit the government’s powers to intercede in what Mr. Bush has called the “wild west” of Waziristan, administration officials said at the time.  During his visit to Washington last fall, General Musharraf said the agreement he signed with tribal leaders, giving them greater sovereignty in the region, had “three bottom lines.” He said one was “no Al Qaeda activities in our tribal agencies or across the border in Afghanistan.” The second was “no Taliban activity” in the same areas. And the third was “no Talibanization,” which he described as “obscurantist thoughts or way of life.”  American intelligence officials have made an assessment that senior Qaeda leaders in Pakistan have re-established significant control over their global network and are training operatives in some of the camps for strikes on Western targets.  One American official familiar with intelligence reports about Pakistan said intelligence agencies had established “clear linkages” between the Qaeda camps and the plot to blow up trans-Atlantic flights that was thwarted last August. American analysts said the recent trials of terrorism suspects in Britain showed that some defendants had been trained in Pakistan.  American officials say one reason General Musharraf agreed to pull government troops back to their barracks in North Waziristan and allow tribal leaders greater control over security was to give him time to rebuild his intelligence network in the border region gradually.  A version of this article appears in print on , on Page A1 of the New York edition with the headline: PAKISTAN FACES WARNING BY BUSH TO ACT ON TERROR. Order Reprints| Today's Paper|Subscribe
President Bush will send a tough message to President Pervez Musharraf that U.S. aid could be cut unless he becomes more aggressive in hunting Al Qaeda leaders.