http://dailycaller.com/2018/05/09/doj-top-secret-source-nunes/
During one of their meetings, Halper asked Papadopoulos about Russia and emails, according to sources close to Papadopoulos’s version of the encounters.
TheDCNF also learned that Halper approached two other Trump campaign advisers, including Carter Page. Halper invited Page to attend a symposium at Cambridge in July 2016.
Another campaign official told TheDCNF they were contacted by and met with Halper several days before Halper’s initial outreach to Papadopoulos. That official, who did not want to be identified, said they were surprised to learn of the Papadopoulos encounter.
I think it’s significant that Halper was already involved in July 2016 (meeting with Page), because that fits the timeline better, than if it was first in September with Papadopoulos.