What is the biblical precedent for Satan indwelling the Antichrist?
The biblical precedent cited is Judas, whom Satan entered and literally took over and used. That earlier instance foreshadows what will happen to the Antichrist: Satan will indwell him, control him, and use him after being cast out of heaven at the tribulation's midpoint.
Les teaches that at the midpoint of the tribulation, the Antichrist comes from his headquarters, likely in Europe, to Jerusalem. At that same moment, Satan is cast out of heaven and indwells this man, the Antichrist. Les explains that this has happened before, and the best example is Judas: when Satan entered in and literally took over Judas and used him, so also he will do with the Antichrist. Satan will indwell him and control him. Later, when Satan in the man Antichrist sees the escaping group of Jews, he acts like Pharaoh, who sent an army after the escaping Jews from Egypt; the Antichrist casts out water as a flood after the woman to destroy her. These Jews are under God's sovereign, mandated protection.