All personnel are reminded that holding a clearance is a privilege, not a right," read a memo announcing the action.

United States and NATO officials were set to meet Wednesday to discuss security guarantees for Ukraine as the White House worked to arrange a summit between Volodymyr Zelenskyy and Russia's Vladimir Putin.

The FBI raided the home of former national security adviser John Bolton Friday morning at the order of FBI Director Kash Patel.

Former deputy national security advisor KT McFarland joins 'Fox & Friends' to discuss the feud over security guarantees for Ukraine and the Trump administration's decision to send warships near Venezuela.

Military chiefs from the United States and a number of European countries on Thursday presented options to their national security advisers for providing security guarantees to Ukraine, officials said.