Question

in 1975 supreme court justice potter stewart spoke to a group of reporters about freedom of the press he said "if you look at the literal language in the 1st amendment of the constitution it says congress shall pass no law abridging freedom of press. it says nothing about reporters privilege. The very fact that protections are available is attributable to the creative work of the judiciary over the last 190 years" What did stewart mean by this statement?....not what the privileges reporters do and don't have.