While the president, Congress and the U.S. Supreme Court continue to clash over immigration, Professor Polly Price, a legal historian and expert in immigration and citizenship, says 19th century case law is still a powerful influence. Price was invited to the U.S. Supreme Court to deliver the lecture, "The Supreme Court and the Chinese Exclusion Cases." The 2016 Leon Silverman Lecture, delivered May 11, was derived from Price's research on citizenship and immigration law, and given in the court's main courtroom.