Joe Biden on Trump's attacks: "It doesn't really matter whether or not he's gone after me. I've got to be in a position that I think about the American people. I can't hold a grudge. I have to be able to not only fight, but also heal." https://t.co/zUDgaLzPL2 #DemDebate pic.twitter.com/XezKf2OaWH— ABC News (@ABC) January 15, 2020