Carter Page, a former foreign policy adviser to then-presidential candidate Donald Trump, speaks at a news conference at the RIA Novosti news agency in Moscow in December. Page said he was in Moscow to meet with businessmen and politicians. Pavel Golovkin/AP hide caption

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Pavel Golovkin/AP

Listen: Adam Entous on FBI's FISA Court Warrant To Monitor Page

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A man takes a photograph with his cell phone of names on the walls of "Empty Sky Memorial" at Liberty State Park in Jersey City, New Jersey. The concrete and steel memoria pays tribute to the 746 citizens of New Jersey who lost their lives on Sept. 11. Justin Sullivan/Getty Images hide caption

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National Intelligence Director James Clapper leaves the Capitol after briefing members of Congress earlier this month. The Senate voted Friday to extend the FISA Amendments Act to 2017, granting federal agencies wide surveillance powers. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP