The Shallow State of Donald Trump

[H2O Man]

4. At the time,

I would speculate that it is most likely the ONI was conducting a counter-intelligence investigation of the Russian mob/ intelligence. There is nothing to suggest that Page was involved in investigating the campaign itself, with the possible exception of Manafort. But for half his time with the campaign, Page was reporting directly to Corey Lewandowski, not Mamafort. So at least for the first three months, it seems Page's most important role -- for the campaign or for the ONI -- would be monitoring the Russian outreach.

Just my opinion, of course.