The Islamic State has now claimed credit for the attack in Manchester, England. What happens in the hours between an act of terror and the claiming of responsibility? Plus: highlights from the latest testimony of a U.S. official about ties between Russia and the Trump campaign. Guests: Rukmini Callimachi, who covers the Islamic State; Matt Apuzzo, who covers the C.I.A. For more information on today’s episode, visit http://nyti.ms/2rD5ve0.

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