TULSA, Oklahoma - Republican presidential candidate Dr. Ben Carson is planning a visit to Tulsa Thursday morning to sign copies of his book "A More Perfect Union." 

The event at the Barnes and Noble store on 41st Street east of Yale. won't start until 11:30 a.m. but a line began forming before 6 a.m. outside the store to see the presidential candidate.

Dr. Carson was in Oklahoma City on Wednesday and his campaign says the candidate is taking time away from the campaign to visit 40 cities across the U.S. for the book signing tour.