As the number of missile-wielding states grows and as the nuclear club expands, the likelihood of a missile being unleashed against the American people or their allies—whether by mistake, miscalculation, or a madman—also grows. Missile defense doesn’t eliminate the danger, but it does give us a fighting chance to confront it.

After North Korea’s successful ICBM test on July 4, does the Trump administration have any realistic policy options to deter the Kim Jong-un regime?