Indiana has scheduled a test of its statewide emergency alert system for tornadoes on Tuesday, March 10. Here's what to ...

Sen. Joni Ernst, R-Iowa, joins ‘Varney & Co.’ to discuss mounting TSA delays amid stalled Homeland Security funding, the impact on essential workers and whether President Donald Trump could deploy ...

Charles Marino / National Security Contributor ...

Although Sean Plankey's access badge was taken and he was escorted out of Coast Guard headquarters Monday, he remains the ...

US intercepts suspected Iranian signal that may activate sleeper cells abroad. A police personnel stands guard outside the US ...

INDIANAPOLIS – Don’t be alarmed if you hear tornado sirens Tuesday morning. It’s part of a statewide tornado drill scheduled ...

The US intelligence community has issued a flurry of private warnings in the past week to American companies and government agencies urging vigilance and the hardening of possible targets of cyber ...

On March 5, President Donald Trump has nominated Republican Senator Markwayne Mullin of Oklahoma to replace Kristi Noem as the new Homeland Security Secretary ...

The alert reportedly referenced “preliminary signals analysis” of a transmission “likely of Iranian origin.” ...

The U.S. recently intercepted encrypted messages believed to be from Iran that could serve as an “operational trigger” for “sleeper assets,” according to a federal government alert sent to law ...

Multiple Israeli officials tell ABC News that Israel has determined that Iran's Supreme Leader Ayatollah Ali Khamenei was killed in the joint U.S. and Israeli strikes on Tehran earlier Saturday. U.S.