The nomination of Dr. Ronny L. Jackson, President Trump’s personal doctor, as the next head of Veterans Affairs has come to an abrupt stop. Now, Congress is beginning to examine several alarming allegations from unidentified whistle-blowers that derailed the doctor’s Senate confirmation process. Guest: Michael D. Shear, a White House correspondent for The Times. For more information on today’s episode, visit nytimes.com/thedaily.