On Thursday, Harry Potter author JK Rowling decided to make a point about how Donald Trump, the current President of the United States, is often embarrassingly unpresidential.

To highlight the failings of the 45th president, she screen-grabbed two particularly childish and unpleasant recent tweets of his, aimed at the television host Mika Brzezinski, and juxtaposed them with a quote that she attributed to the 16th president, Abraham Lincoln: “‘Nearly all men can stand adversity, but if you want to test a man’s character, give him power”.