Members of the U.S. Supreme Court clashed over the value of university affirmative action policies, and pivotal Justice Anthony Kennedy raised the prospect that the court might put off issuing a broad ruling.

In a sometimes-heated argument Wednesday that ran more than 30 minutes beyond its allotted hour, the court¡¯s liberal wing defended the University of Texas program as a means of fostering diversity. Members of the court¡¯s conservative majority questioned whether racial preferences were warranted. Justice Antonin Scalia said that perhaps the university ¡°ought to have fewer¡± minority students.

¡°One of the briefs pointed out that most of the black scientists in this country don¡¯t come from schools like the University of Texas,¡± Scalia said. ¡°They come from lesser schools where they do not feel that they¡¯re being pushed ahead in classes that are too fast for them.¡±