Ashton B. Carter and William J. Perry, former Clinton assistant secretary of defense and secretary of defense, respectively, call for the United States to blow up on the launch pad the North Korean missile that has recently been fueled and made ready for launch:
[I]f North Korea persists in its launch preparations, the United States should immediately make clear its intention to strike and destroy the North Korean Taepodong missile before it can be launched. This could be accomplished, for example, by a cruise missile launched from a submarine carrying a high-explosive warhead. The blast would be similar to the one that killed terrorist leader Abu Musab al-Zarqawi in Iraq. But the effect on the Taepodong would be devastating. The multi-story, thin-skinned missile filled with high-energy fuel is itself explosive -- the U.S. airstrike would puncture the missile and probably cause it to explode. The carefully engineered test bed for North Korea's nascent nuclear missile force would be destroyed, and its attempt to retrogress to Cold War threats thwarted. There would be no damage to North Korea outside the immediate vicinity of the missile gantry.
Read their whole argument here.
Former Vice-President Walter Mondale has endorsed similar action. Charles Pritchard in the WaPo argues against a pre-emptive strike.