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In 2008 he announced that he was joining Yisrael Beiteinu. He was placed second on the party's list for the 2009 elections, and was returned to the Knesset as the party won 15 seats. After Yisrael Beiteinu joined the Likud-led coalition, Landau was appointed Minister of National Infrastructure (after which he changed its name to the Ministry of Energy and Water).