Iran's hard-line president urged students Tuesday to push for a purge of liberal and secular university teachers, another sign of his determination to strengthen Islamic fundamentalism in the country. Speaking to a group of students Tuesday, Ahmadinejad called on them to pressure his administration to keep driving out moderate instructors, a process that began earlier this year. Dozens of liberal university professors and teachers were sent into retirement this year after Ahmadinejad's administration, sparking strong protests from students, named the first cleric to head Teheran University. "Today, students should shout at the president and ask why liberal and secular university lecturers are present in the universities," the official Islamic Republic News Agency quoted Ahmadinejad as saying during a meeting with students. The president complained that reforms in the country's universities were difficult to accomplish and that the educational system had been affected by secularism for the last 150 years. But, he added: "Such a change has begun."