The BBC, the biggest broadcaster in the world, is in turmoil. Where there is turmoil, these days it’s also common to find President Donald Trump. So it is in this case. He is threatening a $1 billion lawsuit.

The BBC’s two topmost executives, Director General Tim Davie and Deborah Turness, chief executive of the news division, have quit amid a scandal involving reporters and editors doctoring video to make it look, falsely, as though Trump directly called for violence at the Capitol on Jan. 6, 2021.