Judy Woodruff:

We continue our look now at what is in the Mueller report.

The last two nights, we looked at volume one, Russian interference and outreach to the Trump campaign. Given that most Americans don't have the time to read the entire 448-page report, we're trying to help explain its key concepts.

Tonight, we turn to volume two and look at alleged obstruction of justice.

Lisa Desjardins and William Brangham are our guides.