A spokesman for Graham said that he was in San Diego for an evangelical mission led by his father and could not be reached for comment.
Falwell, reached by telephone, said that he regretted saying in a 60 Minutes interview last year that he had concluded after reading books on Islam that "Muhammad was a terrorist."
He said that he was unhappy to learn of Wednesday's event only through calls from reporters, but he supported the evangelical leaders' call to temper the language on Islam.
"In this media sensitive world, we must be cautious that we walk a tightrope that does not allow offending others while at the same time never compromising what we believe," Falwell said.
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