Netanyahu made the comments after meeting with U.S. President Barack Obama in White House talks Monday. Obama said world powers will negotiate with Iran in a "clear-eyed" manner and will consult Israel closely.
Netanyahu's visit comes three days after Obama and Iranian President Hassan Rouhani conducted the highest-level contact between the countries in more than three decades.
That telephone call fueled hopes for a resolution of Iran's decade-old nuclear standoff with the West.
Iran has long insisted its nuclear program is peaceful. The U.S. and many of its allies disagree and have helped impose several rounds of sanctions that have battered Iran's economy.
Netanyahu is deeply concerned about eased tensions between Iran and the international community, saying Tehran is using talks to try to lessen the crippling sanctions and to buy more time to build a nuclear weapon.
Many Israelis agree.
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