Opinion | Trump has violated his oath of office — via Twitter

President Trump's Labor Day tweet about Attorney General Jeff Sessions is even more atrocious than usual, columnist David Ignatius says. Read more: https://wapo.st/2Q61lV4. Subscribe to The Washington Post on YouTube: http://bit.ly/2qiJ4dy Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/