I think there is something of a method to Trump's madness.  Consider where he is spending his time and energy:
- a ginned up controversy in which he pretends to care whether NFL players stand during the national anthem.
- the pathetic 'controversy' about Christmas.
- arguing with a FL congresswoman about what he said to a soldier's widow (We know he's lying: "I have proof" is invariably Trump-speak for "I'm lying through my teeth.")
- threatening John McCain ("It won't be pretty.") Trump is a punk and a coward who should count himself lucky if MCain allowed him to lick his boots.
What these things have in common is that none of them requires Trump to know anything or even to pretend to know anything; he just spews his customary filth and thus distracts from policy questions, like healthcare.  Yesterday he took three positions on the Alexander/Murray healthcare compromise -- because he doesn't know the first damn thing about healthcare and isn't remotely interested it.