On today’s episode:

• Matt Apuzzo, one of the reporters who has been investigating the ties between the Trump campaign and Russia, discusses unearthing Donald Trump Jr.’s emails and demystifies the term “collusion.”

• We hear from Rukmini Callimachi and her producer, Andy Mills, as they travel through the streets of Mosul in the hours after the Iraqi government declared victory over Islamic State militants.

Background reading:

• Russian dirt on Clinton? “I love it,” Donald Trump Jr. said in an email.

• Photographs of what ISIS left behind in Mosul.

Tune in, and tell us what you think. Email us at thedaily@nytimes.com. Tweet me at @mikiebarb.

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