Commander in Chief: Partisanship, Nationalism, and the Reconstruction of Congressional War Powers - Hardcoverby Casey B. K. Dominguez (Author) The constitutional balance of war powers has shifted from Congress to the president over time. Today, presidents broadly define their constitutional authority as commander in chief. In the nineteenth century, however, Congress was the institution that claimed and defended expansive war powers authority. This discrepancy raises important questions: How, specifically, did Congress define the boundaries between