The current president of the United States, Donald Trump, has been identified as the reason for a large shift in American foreign policy towards a doctrine closer to that of political realism. This claim has led us to examine if this transformation could be detected and described if we analyzed and compared Trump’s foreign policy doctrine with his predecessor, Barack Obama, through the lens Thomas Hobbes, whose ideas are at the core of the three modern schools of political realism. Accordingly, in this thesis, we deduce an analytical framework from the original corpus of Hobbes, where anarchy is divided into moral and empirical variables, identified as the primary factors for behavior in international settings. This is then applied inductively via a comparative qualitative content analysis to two primary documents, the National Security Strategies of 2010 containing the foreign policy doctrine of Obama, and the National Security Strategy of 2017 containing the doctrine of Trump. Our thesis shows a large shift in how the Presidents view the world in moral terms, or how they see it fit for the American executive to act on the international stage. And a relatively minor shift in empirical terms, or their perception of the foundational reality of the world system which they both consider to be of an anarchical nature closely connected to the theoretical model presented by our interpretation of Hobbes