Robert S. Mueller III, the former special counsel, will testify before the House Judiciary Committee and the House Intelligence Committee beginning at 8:30 a.m. Eastern on Wednesday. We spoke to our colleague about what to expect. Guest: Michael S. Schmidt, who has been covering the special counsel investigation for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading: Read more about what you need to know before the testimony.Here are 19 lingering questions for Mr. Mueller, along with what we know or don’t know about the answers.