Constitutional crisis? It's already here

Much talk in the last two years has been about the constitutional crisis that wold ensure were Trump to cut short Mueller's investigation into Russian interference in the election. While that would indeed be appalling, the constitutional crisis has been growing quietly for several months.

Members of Trump's own Cabinet (for example Tillerson, Mattis  and Cohen) have been hiding information and memos, not acting on Trump's directives and generally only implementing policy that they consider acceptable.

Now that's a constitutional crisis!