Donald Trump needs to experience some disappointment very soon in his Presidency, react to this as best he can and learn from the experience.

There is reason to think that responding to setbacks (something that all persons in public life must experience many times in their public career) is, to put it delicately, not one of his strengths.

He needs to develop a thicker skin and a willingness to recognize (if only to himself) and accept with some dignity occasions where he has (perhaps with cause) failed.