On July 17, 2020 the Senate Judiciary Committee released a 59 page summary of the FBI interview with the Primary Sub Source for the Steele Dossier. This interview took place in January 2017. The FBI would continue to use this information from this source to renew the FISA application on Carter Page at least two more times. Keep this in mind as I reveal the identity of this person. They knew in January 2017 exactly who this person was and this person's qualifications for accusing the President of the United States of conspiring with a foreign power. This dossier was also a key component of the Intelligence community's assessment that Russia interfered in the election.
Here is a link to the summary of the interview (with redactions). Many of these redactions will be revealed in the next post.
The primary sub source was the person who gathered Intel for Christopher Steele and Orbis Intelligence on behalf of the Hillary Clinton campaign and the Democratic National Committee.
This is the person responsible for the material that led to a Special Counsel and 2 years of political chaos in the United States.