"But the extensive interview with Steele, and the investigators’ sense that he offered new and important information, may dampen expectations among the president’s allies who’ve claimed that Steele’s sensational dossier was used improperly by the bureau to “spy” on the campaign.
Page had been on the FBI’s radar since 2013, when he interacted with undercover Russian intelligence agents in New York City. A trip to Moscow in the summer of 2016 further aroused the bureau’s suspicions, according to the Foreign Intelligence Surveillance Act warrant the FBI got approved in October 2016, allowing the bureau to intercept his electronic communications.
Steele’s defenders have noted that the information he provided which made it into the FISA warrant application to monitor Page was not far off. According to Steele’s sources, Page met with high-level Russian officials while in Moscow in July 2016, including the CEO of Russia’s state-owned oil giant Rosneft. "
https://www.politico.com/story/2019/07/09/christopher-steele-trump-dossier-doj-1403318