ALEXANDRIA, Virginia — The FBI offered British ex-spy Christopher Steele an “incentive” of up to $1 million if he could prove the allegations in his since-discredited anti-Trump dossier, but the former MI6 agent was unable to back up his claims, according to new court testimony. The bombshell revelation came during special counsel John Durham’s false statements trial against Steele’s main dossier source, Russian-born lawyer Igor Danchenko, who has been charged with repeatedly lying to the bureau about his sourcing for information he provided for the dossier in 2016. Danchenko has pleaded not guilty. FBI supervisory intelligence analyst Brian Auten, who...