Mazars Subpoena – a totally off-topic but interesting aside . . .

Yesterday’s District of the District of Columbia opinion about the Congressional subpoena to Mazars (President Trump’s accounting firm), offers a fascinating summary of the history of legislative-executive friction about similar subpoenas, including the complaints of the rarely-quoted President Buchanan. In an echo of McCulloch v. Maryland about the broad scope of Congress’s power to legislate, this opinion describes a similarly-broad scope of the power to investigate before legislating.