Trump Wants More US Nuclear Weapons Tests. What Does That Mean?

US President Donald Trump has said he’s instructed the Defense Department to start testing nuclear weapons “on an equal basis” with rivals such as Russia and China.

It’s unclear whether he means detonating nuclear warheads, which would reverse decades of American policy and violate a de facto global ban, or a scale-up of something the country already does: testing weapons delivery systems, such as intercontinental ballistic missiles, that can carry nuclear warheads.