Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

A subsurface atomic test near Yucca Flats, Nev., in March 1955. (U.S. Atomic Energy Commission via AP) In what would be a major shift in a decades-old American policy against global nuclear ...

President Trump has announced plans to begin testing nuclear weapons, raising fears of a new arms race as Russia and China respond with warnings. President Trump has announced plans to begin testing ...

WEST PALM BEACH, Fla. (AP) — New tests of the U.S. nuclear weapons system ordered up by President Donald Trump will not include nuclear explosions, Energy Secretary Chris Wright said Sunday. It was ...

A Pakistani official told CBS News that the country "will not be the first to resume nuclear tests" in response to President Trump's assertion in an interview with 60 Minutes that the country has ...

In what would be a major shift in a decades-old American policy against global nuclear proliferation, President Trump says he has directed the Pentagon to “start testing” U.S. nuclear weapons “on an ...