Charges of foreign power interference in the U.S. presidential election have raised grave national security concerns and touched off multiple federal inquiries that could drag on for months.

U.S. strategic and tactical nuclear weapons on land, in the air, and at sea, will undergo costly and extensive modernization in the coming years.

The Federal Bureau of Investigation has been reoriented toward counterterrorism in recent years, but continues to face charges of overreach.

The separation of powers has spawned a great deal of debate over the roles of the president and Congress in foreign affairs, as well as over the limits on their respective authorities, explains this …

Pakistan has emerged as a sanctuary for some of the world’s most violent groups, including al-Qaeda, the Taliban, and homegrown militants, that threaten the stability of Pakistan as well as the regio…