The Knesset passed this law and whilst it may be controversial until the HIgh Courts say its otherwise its legal. If its legal then the president has no business overruling legislation just because its controversial. Peres is not there to overrule controversial legislation but anybody who objects to this law has the right to refer it to the HIgh Court and its they who will have the final say on the matter. There is a legal process.
Boko Haram militants kill 11 Chadian soldiers (Reuters)
from the article: Peres must stop destruction of Israeli democracy