This will not go over well for the 2009 Nobel Peace Prize winner.

According to the new book “Double Down,” in which journalists Mark Halperin and John Heilemann chronicle the 2012 presidential election, President Barack Obama told his aides that he’s “really good at killing people” while discussing drone strikes.

Peter Hamby of The Washington Post reported the moment in his review of the book.

The claim by the commander-in-chief is as indisputable as it is grim.