Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

Israeli Prime Minister Benjamin Netanyahu’s dramatic presentation on Iran’s defunct nuclear program — with his claim that tens of thousands of files prove there was an effort to build and test weapons — didn't contain any big surprises for the U.S. intelligence community, two U.S. intelligence officials told NBC News.

The information unveiled by Netanyahu with great fanfare on Monday has largely been known to American intelligence agencies for years, the officials said, confirming the assessment of Washington lawmakers and private experts.

Other U.S. intelligence officials added that nothing in the documents, which Netanyhu said were smuggled out of Tehran, has changed the American intelligence judgment that Iran is living up to its agreement not to restart a nuclear weapons program, as American intelligence officials told senators Feb. 13.

Israeli Prime Minister Benjamin Netanyahu, right, and U.S. Secretary of State Mike Pompeo in Tel Aviv on Sunday. Thomas Coex / Pool via Reuters

Then-CIA Director Mike Pompeo reconfirmed that assessment when asked about it on April 12 during his confirmation hearing for secretary of state. "With the information I've been provided, I've seen no evidence that they are not in compliance today," he told the Senate Foreign Relations Committee.

Outside experts were dismissive of Netanyahu's presentation.

"There is literally nothing new here," said Jeffrey Lewis, an arms control expert who favors the Obama-era nuclear deal with Iran from which President Donald Trump is contemplating an American exit.

Nothing in Netanyau's presentation suggested that Iran had restarted a secret nuclear program. He argued instead that by keeping the archive — and maintaining the position of a key nuclear scientist who once ran the weapons program — they could restart very quickly. Defenders of the deal say that is precisely why the U.S. should not give Iran an excuse to do so by exiting the deal.

Lewis' view was echoed by American intelligence officials, who told NBC News that while the documents may contains new details, the story they tell — that Iran once had an unauthorized nuclear program — is an old one.

It was largely described in a 2007 National Intelligence Estimate, which said that U.S. spies "judge with high confidence that in fall 2003, Tehran halted its nuclear weapons program."

The document added, "We also assess with moderate-to-high confidence that Tehran at a minimum is keeping open the option to develop nuclear weapons."

"It's nothing new," Sen. Bob Corker, R-Tenn., told Bloomberg Television. "This is really not groundbreaking — we've known of this for some time."

Pompeo told reporters that Israel briefed the U.S. on the documents so the Americans could authenticate them. Now, Israel is giving them to the other signatories to the Iran deal — Britain, France and Germany.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

Corker said he doesn't think the Israeli presentation should effect the Trump administration calculus about whether to pull out of the deal.

But some U.S. officials fear it will, and they cite a mistake by the White House press office Monday night, which issued a news release saying that Iran "has" a "robust, clandestine nuclear weapons program."

The White House later corrected the statement on its website, but never sent out a corrected news release — blaming the mistake on a "clerical error."

Asked to respond to Corker, Pompeo, who has been critical of the Iran deal, told reporters on his flight back from the Middle East Monday night:

"Well, that's partly true. The existence of the (nuclear weapons) program that ended roughly December of 2003, January of 2004 — it is accurate to say that the knowledge of that has been known for, the fact of that had been known for quite some time. But there are thousands of new documents and new information. We're still going through it. There's still a lot of work to do to figure out precisely the scope and scale of it."

However, the International Atomic Energy Agency — the global nuclear watchdog, which conducts inspections in Iran, hunting for evidence it is violating the nuclear deal — has also concluded that Netanyahu's announcement was old news.

In December 2015, the agency reminded people in a statement, the IAEA issued a detailed report on Iran's nuclear program.

"In the report, the agency assessed that, before the end of 2003, an organizational structure was in place in Iran suitable for the coordination of a range of activities relevant to the development of a nuclear explosive device," the statement said.

Although some activities took place after 2003, they were not part of a coordinated effort, the IAEA said.

The report also concluded that the international watchdog "had no credible indications of activities in Iran relevant to the development of a nuclear explosive device after 2009."

Netanyahu said the documents he revealed, stolen by Israel's Mossad spy agency, showed that Iran has been lying for years about its nuclear program.