Bush is making national security and the fight against terrorism the centerpiece of his re-election campaign. In the speech, he sought to rally Americans behind him in the cause, reminding listeners that the shadow of attack remains.
He chose a friendly setting for the speech -- National Defense University in Washington, where members of his state and defense departments, along with university students and staff, think-tank employees and military veterans applauded fervently throughout his remarks.
Bush walked a delicate political tightrope, using his first public accusations of Khan to illustrate the dangers of rogue arms sales, while avoiding criticizing Pakistan's government.
Musharraf's government claims it knew nothing of Khan's network, though the Pakistani military controlled Pakistan's nuclear program.
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