At the start of 2018, the biggest threat to the Trump presidency was an investigation into his campaign’s ties to Russia. As the year draws to a close, it’s his hush payments to women. We look at what’s behind that change — and how the threat may change again next year. Guests: Mark Mazzetti and Michael S. Schmidt, New York Times reporters who have been covering the special counsel investigation. For more information on today’s episode, visit nytimes.com/thedaily.