Mr. Stone says that he has had no communications with Russian officials other than previously disclosed communications with Guccifer 2.0, the online persona that officials believe was actually Russian intelligence officers. Mr. Stone has acknowledged trading messages over Twitter with Guccifer.
Mr. Page was more circumspect. In an email, he said, “Although I will help in any way that I can, please note that any records I may have saved as a private citizen with limited technology capabilities will be minuscule in comparison to the full database of information which has already been collected under last year’s completely unjustified FISA warrant.”
He was referring to a warrant issued by the Foreign Intelligence Surveillance Court allowing the Justice Department to secretly wiretap his communications. The warrant was issued after investigators concluded that Mr. Page was no longer part of the Trump campaign, and it was based on evidence that he was operating as a Russian agent, officials have said.
Mr. Page, Mr. Stone and Mr. Manafort are all under scrutiny in an F.B.I. investigation into Russian election meddling and allegations of collusion by Trump associates. There are two other separate congressional investigations — one by the Senate panel and the other by the House intelligence committee.
The letter from the Senate committee, which was jointly signed by Senator Burr and Senator Mark Warner, a Virginia Democrat who vice chairman of the panel, asks its recipients to list all the meetings they had with Russian officials or business people from June 16, 2015, through Jan. 20, 2017. It set a May 9 deadline for a response.
Then, by May 19, the committee requested that the recipients hand over records of all communications — including emails, text messages and phone logs — with Russian officials or business people from the same period. It also asks them for information…