Special Counsel Robert Mueller’s investigators met this past summer with the former British spy whose dossier on alleged Russian efforts to aid the Trump campaign spawned months of investigations that have hobbled the Trump administration, according to two people familiar with the matter.

Information from Christopher Steele, a former MI-6 officer, could help investigators determine whether contacts between people associated with the Trump campaign and suspected Russian operatives broke any laws.

CNN has learned that the FBI and the US intelligence community last year took the Steele dossier more seriously than the agencies have publicly acknowledged. James Clapper, then the director of national intelligence, said in a January 2017 statement that the intelligence community had “not made any judgment that the information in this document is reliable.”