They dont have absolute protection, they are obligated by law in their purpose.
And Trump doesnt decides whether something remains law or not, thats what Congress is for.
So was Hillary Clinton; yet I can't even count how many times she breached that trust and got away with it even out in open. It's what they call 'elite immunity'.
The political system has become legally bankrupt, they don't even always co-operate with Congress and comply with orders of evidence anymore.