Well if it works of course it was because of Trump. If it fails it was the Dems or Obama or Hillary.
Ceasing payments would signal an end to the Trump presidency. Americans don't want a "Do it my way or I'll take my ball and go home" guy as President. Purposely attempting to kill the ACA by defunding it will fall squarely on Trump and the Republicans. They can't be that dumb...can they?
And yes, that is a rhetorical question......