With President Donald J. Trump advocating for deep cuts to U.S. foreign aid, debate has renewed over the role of foreign assistance funds in boosting growth, promoting democracy, and saving lives.

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 …