The company and Kansas officials hailed the plan in Dec. to build a reactor by July 4. Deep Fission now says it's only ...

A senior State Department official on Tuesday said the U.S. still is assessing how to implement President Donald Trump's ...

WASHINGTON, March 24 (Reuters) - A senior State Department official on Tuesday said that the U.S. still is assessing how to implement President Donald Trump's order to resume U.S. nuclear weapons ...

GENEVA (AP) — A U.S. official focusing on arms control on Monday provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago and urged countries to ...