The question of collusion seemed to be at the heart of the special counsel’s investigation into Russian meddling in the 2016 election. Does it matter that there may now be evidence of it? Plus, Facebook, Google and Twitter address Russia’s use of their platforms to sway American voters. And we look at the terrorist attack in Lower Manhattan. Guests: Michael S. Schmidt, who covers national security for The New York Times; Jim Rutenberg, The Times’s media columnist. For more information on today’s episode, visit nytimes.com/thedaily.

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