TEHRAN, Iran— Iran’s hard-line president urged students yesterday to push for a purge of liberal and secular university teachers, another sign of his determination to strengthen Islamic fundamentalism in the country.

With his call echoing the rhetoric of the nation’s 1979 Islamic revolution, President Ahmadinejad appears determined to remake Iran by reviving the fundamentalist goals pursued under the republic’s late founder, Ayatollah Ruhollah Khomeini.

Iran still has strong moderate factions, and, since taking office a year ago, Mr. Ahmadinejad has moved to replace pragmatic veterans in the government and diplomatic corps with former military commanders and inexperienced religious hard-liners. His administration also has launched crackdowns on independent journalists, Web sites, and bloggers.

Speaking to a group of students yesterday, Mr. 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 Mr. Ahmadinejad’s administration, sparking strong protests from students, named the first cleric to head Tehran University.

The country’s oldest institution of higher education remains home to dozens more professors and instructors who outspokenly oppose policies that restrict freedom of expression.

“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 Mr. 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.”

It was not clear if Mr. Ahmadinejad intended to take immediate specific measures, or if he was just urging the students to rally.

Mr. Ahmadinejad, in his role as head of the country’s Council of Cultural Revolution, would have the authority to make such changes himself. But his comments seemed designed to encourage hard-line students to begin a pressure campaign on their own, thus putting a squeeze on universities.

“This is the beginning of a so-called cultural revolution. Ahmadinejad and his allies plan to sweep their opponents from the universities,” a Tehran University professor, Saeed Al-e Agha, said. “They want to rule the brains of youth there.”

“Ahmadinejad wants to settle scores with the most important center of critics and opposition and close the door to any opponent before municipal elections in late November,” a human-rights activist, Kouhyar Goodarzi, said. “But his move may prompt a new round of student unrest.”

Liberal and secular professors teach at universities around the country, but they are a minority. Most are politically passive and do not identify with either the hard-liners or the liberal camp.

Public opinion is difficult to gauge because of a lack of independent opinion polls. But Mr. Ahmadinejad must tread carefully among various factions, and strong moderate voices remain.