The Second Senate of the Bundesverfassungsgericht (Federal Constitutional Court) heard oral arguments on June 19, 2001, in the “NATO Strategic Concept” case. The parliamentary fraction of the Party of Democratic Socialism (PDS) in the Bundestag (Federal Parliament) brought the case to the Federal Constitutional Court as an Organstreitverfahren (dispute between federal organs), which permits one federal organ (in this case, the Federal Parliament as represented by one of its party fractions) to challenge the constitutionality of an action taken by another federal organ (in this case, the Bundesregierung [Federal Government - executive branch]). The Federal Government consists of a parliamentary coalition between the Social Democratic Party (SPD) headed by Chancellor Gerhard Schröder, and the Alliance 90/the Greens (Greens), whose most prominent figure in the Federal Government is Foreign Minister Joschka Fischer.