In 1971, President Richard Nixon claimed executive privilege to prevent newspapers from publishing classified documents. He argued that release of the Pentagon Papers, which detailed U.S. involvement in Vietnam, threatened national security. The U.S. Supreme Court ruled in favor of the newspapers. Which of the following provided a legal basis for this Supreme Court decision? (A) The Thirteenth Amendment (B) The decision in Brown v. Board of Education (C) The Civil Rights Act of 1964 (D) The First Amendment