Netanyahu has repeatedly attacked the emerging Iran deal and is reportedly planning to unveil details to US lawmakers to show why he believes it poses a grave danger to Israel.
But US President Barack Obama lashed out at Netanyahu, pointing to the premier's past assaults on an interim deal reached in 2013 under which Iran has already halted much of its uranium enrichment program.
"Netanyahu made all sorts of claims," he told Reuters on Monday.
In a twist of fate, Netanyahu will be speaking as US and Iranian negotiators are hammering out the deal behind closed doors in a lakeside hotel in Montreux with a March 31 deadline looming.
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Thousands of miles from the political storm unfolding in Washington, top US diplomat John Kerry and his Iranian counterpart Mohammad Javad Zarif met early Tuesday after two brief negotiating sessions on Monday.
State Department spokeswoman Marie Harf warned Netanyahu against revealing details of the deal shared in confidence in classified briefings with the Israelis.
"Any release of any kind of information like that would, of course, betray that trust," she said Monday.
"We want to keep talking in these settings, of course, but that would be a problem."
Netanyahu believes the so-called P5+1 group of global powers is planning to ease international sanctions without the ironclad safeguards needed to deny Tehran a nuclear bomb.
Israel itself is widely believed to have nuclear weapons but has never officially admitted to having such an arsenal. Samantha Power, the US ambassador to the United Nations, weighed into the fight on Monday when she addressed 16,000 pro-Israel activists in the US capital.
"The United States of America will not allow Iran to obtain a nuclear weapon, period," she said.
Taking the podium shortly after Power, Netanyahu remained unswerving in his opposition to Obama's policy.