The former British intelligence officer that authored the so-called Trump dossier was told the FBI had someone inside President Trump’s world giving FBI agents information.

This was revealed by Fusion GPS co-founder Glenn Simpson, whose August 2017 testimony before the Senate Judiciary Committee was released Tuesday by ranking member Sen. Dianne Feinstein, D-Calif.

“[M]y understanding was that they believed Chris at this point — that they believed Chris might be credible because they had other intelligence that indicated the same thing and one of those pieces of intelligence was a human source from inside the Trump organization,” Simpson said in his testimony, referring to Christopher Steele, the dossier’s author.

According to Simpson, Steele first went to the FBI to say he was concerned Trump was being blackmailed, fearing a “national security threat.”

When Steele met with the FBI in September 2016, that is when they told Steele they had the similar intelligence from an “internal Trump campaign source,” Simpson testified.

When asked who that source was, Simpson decline to answer on the basis of “security.”

Senate Judiciary Committee Chairman Chuck Grassley previously said he would not release the Simpson testimony, and last week made a criminal referral to the Department of Justice suggesting that Steele may have lied to the FBI.

Fusion GPS helped pay for the controversial Trump dossier, which was a handful of memos compiled by Steele. The allegations connecting President Trump to Russia are mostly unverified, but Republicans have alleged they launched the FBI’s investigation into the possible ties.