Fiona Hill, who served as the White House’s top adviser on Russia affairs until July, told lawmakers she was “shocked” to find out that Steele, a former MI6 officer, was the author of the dossier. That’s in large part because when she had met with Steele in the years leading up to his dossier work, he was “constantly try to drum up business.”

The FBI relied heavily on information from Steele to obtain four surveillance warrants against former Trump campaign adviser Carter Page. Republicans have accused the FBI of improperly relying on the dossier, since its most explosive allegations are unverified. They have also accused the FBI of failing to tell ...