That cant be legal, can it?
It actually happens quite often in politics.
By the way, the article states the "hurting" would come in the form of stricter environmental regulations.
But how often does a president makes these threats publicly?
Never, because doing so is proof of abuse the powers of his office. That it's for reasons of ego instead of personal financial gain doesn't really change what it is. Trump and Zinke both need to go, before the US takes any more steps down the banana republic road.