White House press secretary Karine Jean-Pierre told reporters late Rep. Jackie Walorski was "top of mind" for President Joe Biden at the event when asked to explain what happened. WATCH the ABC News Live Stream Here: https://www.youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP 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 #abcnews #biden