Justice Robert H. Jackson was one of the Supreme Court’s most gifted writers and a longtime intimate advisor to President Franklin D. Roosevelt. Professor Casto nicely illuminates their relationship and Jackson’s legal and political thought."" - David M. O'Brien, author of Justice Robert H. Jackson’s Unpublished Opinion in Brown v. Board""Robert Jackson served with distinction as solicitor general, attorney general, and associate justice of the Supreme Court. His concurring opinion in the Youngstown Steel Seizure Case of 1952 remains a landmark. W. R. Casto adeptly explores in detail Jackson’s nuanced and evolving understanding of a president’s constitutional powers. This is an important book. It not only explains and assesses Jackson’s views, it also helps us gain insight on enduring constitutional issues that remain relevant today."" - John P. Burke, John G. McCullough Professor of Political Science, University of Vermont