Yishai's spokesman told CNN the travel ban against Grass was issued on the basis of an Israeli law that enables the government to deny former Nazis from entering the country.
Both Shas leader Eli Yishai and Yisrael Beiteinu leader Avigdor Lieberman dismissed Annapolis as a pathetic joke and claimed that there is no reason for them to resign from the Olmert government.
Mr Netanyahu is aware that if the talks stall and American pressure on him mounts, he may have to ditch Messrs Yishai and Lieberman and bring Ms Livni into a ruling coalition instead.