It doesn’t matter if the resort only charges cost, as acting White House Chief of Staff Mick Mulvaney vowed Thursday — or if it’s “by far and away the best physical location.” It’s still wrong.

Even if the place is absolutely perfect — so good that it will have other world leaders backing Washington’s position on everything — it’s still the president’s resort.

Fine: Trump is rightly proud of what he built in his earlier career. But he has a new job now — and a public trust.

When you become leader of the Free World, there are some things you have to give up, including any hint of promoting your own properties.