The top Democrat on the Senate Intelligence Committee revealed on Sunday that the author of the Trump dossier has “refused” to meet with the panel to discuss his infamous report.

“This is a fairly damning indictment, and I wish Mr. Steele would talk to our committee. We’ve reached out. He’s refused to do so, so far. We hold out the option that the chairman and I have said we’ll meet him any place, anywhere,” Virginia Sen. Mark Warner said on NBC’s “Meet the Press.”

Warner, the vice chairman of the Intelligence committee, was talking about Christopher Steele, the former MI6 officer who began working on the dossier last June. Steele, who is based in London, met in recent months with investigators working for Special Counsel Robert Mueller.

Steele’s willingness to cooperate with the Senate panel has been the subject of disagreement recently. During a press conference last month, North Carolina Sen. Richard Burr, the chairman of the committee, told reporters that his investigators had “hit a brick wall” in its investigation of the dossier because Steele had refused to cooperate.