And while Graham has no problem stepping all over the rights of US citizens when it comes to Miranda he really, really has no problem with the fact that terrorists can legally buy weapons.
nytimes.com

“Yes, if you are on the terrorist watch list, the authorities can keep you from getting on a plane but not from purchasing an AK-47. This makes sense to Congress because, as Graham accurately pointed out, “when the founders sat down and wrote the Constitution, they didn’t consider flying.”