He keeps trying to get them to focus on Trump, without success.

WATCH: Joe Biden explodes when a reporter asks a very simple question:

"How was your role as Vice President in charge of policy in Ukraine and your son's job in Ukraine, how is that not a conflict of interest?"

Biden: "I'm not going to respond to that!"

What is he hiding? pic.twitter.com/jbycKLARhE

— Trump War Room (@TrumpWarRoom) October 4, 2019