1. Sean Spicer resigned from his post as White House press secretary after telling President Trump that he vehemently disagreed with his appointment of Anthony Scaramucci, a Republican donor and investor, as communications director.

Mr. Scaramucci, above, a Fox News contributor known for his spirited defense of Mr. Trump, is an unusual choice given his lack of traditional communications experience. Sarah Huckabee Sanders will succeed Mr. Spicer. Here’s a look at the Trump message machine.