President Donald Trump arrives in Las Vegas following deadly mass shooting

The president visits a city in mourning after the deadliest mass shooting in modern US history left 59 dead and hundreds more injured. 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://gma.yahoo.com/