NEW YORK (CNN) -- A business school professor who taught George W. Bush at Harvard University in the early 1970s says the future president told him that family friends had pulled strings to get him into the Texas Air National Guard.

Yoshi Tsurumi, in his first on-camera interview on the subject, told CNN that Bush confided in him during an after-class hallway conversation during the 1973-74 school year.

"He admitted to me that to avoid the Vietnam draft, he had his dad -- he said 'Dad's friends' -- skip him through the long waiting list to get him into the Texas National Guard," Tsurumi said. "He thought that was a smart thing to do."