If there is anything we have learned about Donald Trump since he
descended his golden escalator 18 months ago to announce his
presidential campaign, it’s that his ego is easily bruised and that he
holds a grudge against whoever did the bruising. He gets and remains
angry at people who have criticized him, belittled him, or stolen his
spotlight, and feels compelled to lash out.

(via How Long Can Trump Tolerate the ‘President Bannon’ Headlines? | The Fiscal Times)