The president of the University of Nevada, Reno says "Fahrenheit 9/11" filmmaker Michael Moore "must be allowed to speak" when he visits the campus this week.

Moore's scheduled appearance Wednesday has prompted criticism from Republican student groups and some alumni. In response, UNR President John Lilley has written a letter underscoring the university's commitment to free speech.

"I encourage the students, faculty and community to respect Mr. Moore's right to express his views and to remind others of his right to express them," Lilley wrote last week. "Whatever you think of his views, he is now a guest of the university, and he must be allowed to speak."

Several donors and alumni are upset that the school's student government has rejected their offer of $100,000 to have Moore debate a conservative spokesman during his appearance.

Rick Reviglio, a Republican whose family has given about $1 million to the university, said his donations could cease if Moore, whose "Fahrenheit 9/11" blasts President Bush, doesn't debate a conservative during his visit.

"We have given generously to the university, and to see that money being spent frivolously on the likes of people like Michael Moore is upsetting," said Reviglio, general manager of Western Nevada Supply in Reno.

Moore has been encouraging students to vote. His college tour, which ends Nov. 2 in Tallahassee, Fla., has drawn sellout crowds, as well as heated criticism at almost every stop.

Lilley said Moore's speech is expected to attract an audience of about 9,000 to the Lawlor Events Center.

The university's student government voted last month to contribute $6,300 in student-fee funds to Democracy for Nevada, a student political action committee and recognized campus club, which is sponsoring the appearance. The balance of Moore's $33,000 speaking fee will come from fund-raising projects and ticket sales.

Lilley said the student government also has made funds available to the College Republicans and interested parties so they can invite a speaker of a different point of view. He said those plans are pending.