Representative Paul D. Ryan, the Republican chairman of the House Budget Committee, has been excoriated by some Roman Catholic leaders ever since he claimed this month that his budget plan, which slashes antipoverty programs, was inspired by the moral teachings of his Catholic faith.

The latest criticism comes in a letter released Tuesday and signed by nearly 90 faculty members and priests at Georgetown, the Jesuit university in Washington, in advance of Mr. Ryan’s visit there on Thursday. Mr. Ryan is to deliver the prestigious Whittington Lecture, named for an associate dean who was killed on the airplane that crashed into the Pentagon on Sept. 11, 2001.

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