Geneva Conventions bar Donald Trump's idea of killing terrorists' families, as Rand Paul says

"If you are going to kill the families of terrorists, realize that there's something called the Geneva Convention we're going to have to pull out of."
http://www.politifact.com/truth-o-meter/statements/2015/dec/17/rand-paul/rand-pauls-right-geneva-conventions-bar-donald-tru/