The nation's missile defense system, which now includes about a dozen interceptor missiles in Alaska and California and on some Navy ships, has suffered multiple test failures since President Bush ordered the Reagan-era program accelerated in early 2001.
Missile defense experts disagree on current U.S. ability to destroy a long-range missile once it is fired. But they seemed in agreement that shooting at it — and missing — would be a huge embarrassment.
A better solution, said Mr. Bush's national security adviser, Stephen Hadley, was for the North to "give it up and not launch" the missile that the U.S. believes is being fueled and prepared. "We think diplomacy is the right answer and that is what we are pursuing," Hadley said.
Tensions persisted over North Korea's apparent preparations to test-fire a Taepodong-2 missile amid disagreements over U.S. military options for responding. The missile, with a believed range of up to 9,300 miles, is potentially capable of reaching the mainland United States.
Pentagon officials said they were prepared to use the nation's missile defense system if needed.
Defense Secretary Rumsfeld said Thursday the decision to fire would be up to President Bush, CBS News correspondent David Martin reports. "The President would make a decision with respect to the nature of the launch, whether it was threatening to the territory of the United States or not," Rumsfeld said.
The program is a downscaled land-and-sea version of a global defense network first proposed by Reagan that was dubbed "Star Wars" by critics. Interceptor missiles — linked to a network of satellites, radar, computers and command centers — are designed to strike and destroy incoming ballistic missiles.
Shooting such a missile down in the air would be a mild reaction compared to what some experts call for, Martin reports. Former Defense Secretary William Perry and one of his top aides, Ashton Carter, are among those calling for destroying the missile while it's still on the launch pad. "It's a big, stationary, conspicuous, and very vulnerable target," Carter said, "and we would simply destroy it with one or two, for example, submarine-launched cruise missiles ... it would be a form of pre-emptive strike."
The Pentagon says the rudimentary system is capable of defending against a limited number of missiles in an emergency — such as a North Korean attack. More than $100 billion has been spent on the program since 1983, including $7.8 billion authorized for the current fiscal year.
In the most recent test, a Navy ship late last month successfully shot down a long-range missile in its final seconds of flight. Before a successful test in the Pacific in December 2005, interceptor tests had failed five of 11 times.