The veteran Israeli leader looks set to form a new coalition government for his fifth term.
About 1,300 secret cameras were deployed by Prime Minister Benjamin Netanyahu's center-right Likud party, according to the Israeli news site Ynet.
The government coalition collapsed Friday after disagreements over the vacant defense minister post.
Herzog said the discovery "arouses disgust and demonstrates Netanyahu's distasteful nature."
Palestinians say accepting Netanyahu's call could deny Palestinian refugees of past wars any right of return.
Israeli prime minister says he will pursue 'responsible policies' in visit to the White House.
David Friedman is against a two-state solution and wants to annex the West Bank.
The Supreme Court ruled that Amona, on Palestinian land, must be razed.
A public outcry over no women scheduled to perform leads to sponsors pulling out of concert.
Repair work on Saturdays to maintain Israel's rail system has sparked a government crisis.
It ensures the use of all force necessary to prevent the capture of an Israeli soldier.
National Aliyah Day will celebrate Jewish immigration to the country.
Isaac Herzog rejected spokesman's Facebook post calling Jewish settlers "murderers."
Coalition minister resigns and opposition lawmakers warn about threat to country's security.
Deputy military chief says he's 'finding signs' of the 'nauseating processes that occurred in Europe...back then' in Israel today.
Reuven Rivlin criticized his own Likud party for inviting an Austrian far-right leader to Israel.
The daily "Israel Hayom," owned by Sheldon Adelson, caused Israel's rating to drop from 'free' to partly free.'
Anat Berko was called an "idiot" by fellow lawmakers after her controversial comments.
Amir Ohana to replace minister being investigated over sexual harassment allegations.
The right-wing Israeli president is an unlikely hero for the liberals of Tel Aviv.
At the eleventh hour, Netanyahu cobbles together just enough votes to form a government.
Prime minister's Likud party continuing negotiations with far-right and ultra-Orthodox groups after winning March election.
Europe's nationalist parties are rushing to support formerly reviled Israel as an ally against the 'scourge' of Islamisation.
In the run-up to the vote, Benjamin Netanyahu pledged to continue building settlements.
Netanyahu facing challenge to secure fourth term as he promises more settlements, no Palestinian state in final push
Opposition leader says he is "utterly serious" about two-state solution as Israelis head to polls.