Israeli Prime Minister Benjamin Netanyahu on Monday revealed a cache of files he claims were obtained from Iran and prove the country ran a secret program to build nuclear weapons.

However, the trove of data did not contain new information that was not known to diplomats who negotiated the landmark Iran nuclear deal in 2015. Iran-watchers said the press conference appeared calculated to embolden Trump to scrap the accord.

To be sure, Iranian leaders have long said their nuclear program is only for peaceful purposes. But Netanyahu on Monday unveiled tens of thousands of pages of documents that he said undercut those claims.

"Tonight I'm here to tell you one thing. Iran lied, big time," he said.

Netanyahu's office billed the televised statement as a "significant development" regarding the Iran nuclear deal, but it largely presented evidence to prove what the world long ago accepted: that Iran sought to develop nuclear arms.

That acknowledgement marshaled international support for a U.S. campaign to impose a tough series of sanctions against Iran. The impact of those sanctions brought Iran to the negotiating table and ultimately led to the 2015 Iran nuclear deal.

Netanyahu's remarks come less than two weeks before U.S. President Donald Trump must decide whether to continue suspending sanctions against Iran under that deal, or restore the penalties on one of the world's biggest oil producers.