Julián Castro says he doesn't regret his clash with Joe Biden, in which he asked whether Biden was "forgetting what you said two minutes ago?"

"I wasn't taking a shot at his age," Castro tells @ABC News. "It's about the health care policy."https://t.co/INdRXlIwFs #DemDebate pic.twitter.com/MPuSiJzo6O

— ABC News (@ABC) September 13, 2019