The FBI was monitoring former Trump campaign adviser Carter Page when he said he spoke with White House chief strategist Stephen Bannon in January of 2017, according to a new report by Politico.

Page, a former foreign policy adviser for the Trump campaign, spoke with Bannon in January of 2017 over the phone. During the call, Bannon told Page to cancel a planned TV appearance that day amid controversy over an opposition research dossier on President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's ties to Russia.

Page at the time was under a federal surveillance warrant filed by the FBI through the Foreign Intelligence Surveillance Act (FISA). A new memo from Republicans the House Intelligence Committee released last week suggests the controversial "Steele dossier" was a major piece of evidence in the bureau obtaining the warrant.

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The memo has been used as evidence by Republicans in Congress that the Russia investigation is politically motivated and that the FBI was working to undermine Trump's presidency.

Because of the warrant, a former Justice Department attorney and national security expert told Politico it's likely the FBI has a recording of Page's conversation with Bannon.

If so, it's possible the FBI has the contents of the full conversation between Bannon and Page, which reportedly focused heavily on the dossier.