 Questions about President Biden's health have been swirling since last month's poor debate performance. Yesterday, the White House press briefing turned tense amid reporters' questions about why a Parkinson's expert had made at least eight visits to the White House in eight months. Late yesterday, the White House physician weighed in. Joining us live now, ABC News White House correspondent Karen Travers. So, Karen, we had that tense back and forth, and then the White House responded. What did it say?