 He articulated his position in a
debate with rabbi David J Goldberg in "The Guardian"s commentary section.He argues that according to the Halakha, "it is entirely legitimate to kill a "rodef" – that is to say, one who endangers the life of another – and this is true, incidentally, even if the "rodef" has not yet actually taken another life".Furthermore, he argues that

It seems clear to me from a commonsense reading of this passage [Babylonian Talmud, Tractate Sanhedrin, folio 73a] that the concept of a "rodef" encompasses those who advocate or incite the murder of Jews.