The Latest Breaking News from National Security

President publicly supporting national security adviser to avoid admitting fault in security blunder, say sources

When top White House defense and national security leaders discussed plans for an attack on targets in Yemen over the messaging app Signal, it raised many questions about operational security and recordkeeping and national security laws. It also puts Signal in the spotlight.

When the natural environment is stretched beyond its ability to meet basic human needs for food, clean air, drinkable water and shelter, it is not just a humanitarian concern for the world community. Research shows that these crises are a matter of national security for the U.S. and other countries.

Signal app messages revealed Yemen bombing timelines, prompting debate about their classification and implications.