Whether the lethal force in question is a drone strike or a gun shot, the law and the Constitution apply in the same way.

WHITEHOUSE: Press Briefing

Obama announced new "presidential policy guidelines" last week on the standards his administration has been using when deciding to launch lethal strikes, including a guideline to strike a target only if it presents an "imminent threat" to U.S. national security and only if the target cannot be captured.

NPR: Drone Strike Comes Despite Transparency Pledge

In a major policy speech Thursday, President Barack Obama raised the bar for U.S. lethal action against terrorist groups, saying the U.S. will strike only at those who pose an imminent threat to Americans, rather than at terrorists who threaten U.S. allies and interests.

WSJ: Militants, Chased From Mali, Pose New Threats

Lucas Leiva had a 20-yard strike tipped over by Wigan keeper Ali Al-Habsi before the Gerrard-Torres combination again proved lethal for the visitors.

BBC: Fernando Torres puts Liverpool ahead at Wigan