President Donald Trump announced that he has ordered the United States to resume nuclear weapons testing "immediately," saying he directed the Department of War to match other nations’ programs.

President Trump’s unexpected declaration on Thursday that he was ordering the U.S. military to resume nuclear testing prompted visions of a return to the worst days of the Cold War, when the United St...

Six policy experts have told the BBC that testing nuclear weapons would raise the stakes in an already dangerous moment where all signs showed the world was heading in the direction of a nuclear arms ...