A preliminary intelligence assessment has found that U.S. airstrikes over the weekend on a trio of Iranian nuclear facilities failed to destroy the program’s key components, likely setting Tehran’s program back by only a matter of months, according to three sources with familiar knowledge of the matter.

The initial report was prepared by the Defense Intelligence Agency, the Pentagon's main intelligence arm and one of 18 U.S. intelligence agencies, said two of the sources, who requested anonymity to discuss classified matters.

The classified assessment is at odds with the statements of President Donald Trump and high-ranking U.S. officials - including Defense Secretary Pete Hegseth. They have said the weekend strikes, which used a combination of bunker-busting bombs and more conventional weapons, essentially eliminated Iran's nuclear program.

Trump has said the attacks were necessary to prevent Iran from developing a nuclear weapon. Iran denies it is seeking such a weapon and says its nuclear program is for peaceful purposes.

Hegseth on Sunday said that the strikes had "obliterated" Iran's nuclear ambitions, while Trump said Iran's crucial nuclear sites had been "completely and fully obliterated."