President Trump tweeted this morning that he was glad his Chief of Staff John Kelly fired "that dog" Omarosa Manigault Newman, who released a tape this morning in which members of Trump's staff discussed how they might respond to rumors of him being recorded using a racial slur.

The big picture: This is not the first time Trump has invoked a "dog" metaphor to insult someone, but its direct use to attack a woman of color has prompted Twitter outrage and debate from prominent figures on both the right and left.

What they're saying: