Late last night, commenter Forbes raised the question of the two-hop method under FISA for gaining additional information. The importance of this lies in the Carter Page FISA. Carter Page has stated publicly (summarized here) that, although he stepped down from the Trump campaign in September, 2016, he remained in touch with members of the campaign and, later, of the transition. Among those with whom Page stayed in touch was Steve Bannon, chief strategist and senior counselor to the president:
Over the weekend, Page told The Federalist that after he left the Trump campaign in late September 2016, he continued to communicate with individuals officially connected to the campaign. “Yes, I stayed in touch with them – including during the transition months and after the start of the new administration,” Page said. While Page refused to identify all of the individuals with whom he maintained a relationship in order to protect their privacy, he confirmed that he remained in contact with Steve Bannon.
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Although the publicly released Page FISA orders redact the surveillance methods authorized and the modes of communication the FBI could target, it is safe to assume that any communication device Page used would be tapped, including cell phones, text, and email. Thus, the FBI would have access to any text and emails Page exchanged with Bannon or other members of the campaign, transition team, or administration, as well as the ability to eavesdrop on any telephone calls.
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But Page went further, telling The Federalist ... “I can also tell you on the record,” Page said, “that one of the things that the FBI investigators were interested in were my early 2017 text messages with Steve Bannon (irrelevant as they may be).”
Page refused to expand on the content of his early 2017 text messages with Bannon, but suggested that the subject matter of those texts was unimportant—it was the FBI’s interest in, and probing about, his exchanges with Bannon that proved infinitely more significant. That probing came when the FBI interviewed Page multiple times in March 2017, at a time when James Comey, Andrew McCabe, and Peter Strzok remained in charge of the Russia collusion investigation.
The issue Forbes raised regarding "Two Hop" relates to the ability of the government to obtain not only the records of the targeted individual (Page) but also of persons "two hops" distant, in a sort of concentric circle around Page. This would, theoretically, give the government the ability to determine how wide Page's conspiracy to collude with Russia was and who its members were. Since Bannon would undoubtedly be in touch with Trump, presumably Trump would fall within those two concentric circles.