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

The world passed a nuclear milestone this week. And, perhaps surprisingly given the recent run of saber-rattling from the likes of Russia and the United States, it’s a positive one.

On October 29, just before meeting with China’s President XI Jinping, President Trump posted on the right-wing social media network Truth Social that “because of other countries [sic] testing programs ...

Senior Russian officials on Nov. 11 said they were still waiting for a White House explanation about what President Donald Trump meant he when said he had instructed the Pentagon to resume nuclear ...

Resuming full testing of nuclear weapons — as President Donald Trump called for last week — would be unnecessary, costly, undermine nonproliferation efforts, and empower the nation’s adversaries to ...

July 16 marked the 66th anniversary of the first nuclear weapons test explosion. The United States’ test, code-named “Trinity,” was exploded in the desert of New Mexico and ignited the nuclear age.

President Trump said Wednesday he directed the Pentagon to immediately start testing U.S. nuclear weapons for the first time since the 1990s to equal testing levels in China and Russia. “The United ...