White House press briefing on Trump's Iran tweet, Mueller investigation | ABC News

White House press secretary Sarah Sanders takes questions from the media followed by analysis on ABC News' "The Briefing Room." SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/ Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: https://www.goodmorningamerica.com/