During the oral argument over Trump v. Slaughter at the Supreme Court, Justice Elena Kagan got seriously exercised. “You’re asking us to destroy the structure of government!” Trump’s solicitor general, John Sauer, wisely declined to respond. She went on. “Where else have we so fundamentally altered the structure of government?” Indeed. The 1934 Humphrey’s Executor case did exactly that as the New Deal got into high gear during FDR’s reign. The Constitution defines three, not four, branches of government. Article I defines all the bits and pieces about the legislative branch. In particular, Section 8 lists the things that Congress...