In 2003, Lerner criticized the left-wing anti-war ANSWER Coalition for the antisemitism that he and others believe is reflected in the rhetoric at ANSWER-sponsored demonstrations.
Regarding the motu proprio Summorum Pontificum, which allows the re-introduction of the Tridentine Mass and the related Good Friday Prayer for the Jews, he said that the Pope took "a powerful step toward the re-introduction of the process of demeaning Jews.