Mr Harper was saved when he staggered into a conference of ambulance workers and pleaded: "Someone help me, I've been shot."
He is being treated at the Royal Liverpool hospital where he has undergone major surgery.
Yesterday he was visited by close personal friend Cherie Blair who was on Merseyside to tour schools and charities.
Mrs Blair, who is a regular guest of the hotel, said: "I know Bill very well, he is a wonderful man. We were all very shocked when we heard about what had happened.