Given that he claims the power to make law and amend law, he SHOULD answer such questions as this one. No one has any reason to believe he won’t imprison people for failing to buy Obamacare.
If he weren’t habitually making law, he could legitimately brush the question off.
It might be telling that he’s thinking “well, I could wish it.”
But coming across as super-fearful before bullies isn’t exactly a picture of strength either. Better to mention the hunters that would be able to hunt traitors, and leave it at that.