Threats

Fears of a nuclear arms race rise as New START expires

Fading U.S. leadership has countries from Poland to South Korea thinking about nuclear-weapons programs of their own.

Threats

Air Force mum on details of Mideast exercise amid military buildup

Similarly, details of a NORAD exercise in Greenland this month were not disclosed.

Threats

Border Patrol agents kill VA nurse during protest

He was the third person shot recently by federal officers in Minnesota, where the Trump administration says they are conducting national-security operations.

Threats

As ICE becomes more violent, state and local officials struggle to fight back

They seek limits and accountability for the deadly immigration crackdown that the White House calls vital to national security.