President Donald Trump insisted Wednesday that Iran did not move nuclear materials before last weekend's strikes on Iranian facilities, contradicting an internal assessment indicating otherwise.

"We're just the opposite," Trump said during a press conference at the NATO summit at The Hague, reports The Hill. "If you knew about that material, it's very hard and very dangerous to move. It's called — many people, they call it dust, but it's very, very heavy. It's very, very hard to move. And they were way down. You know, they're 30 stories down. They're literally 30-35 stories down in the ground."

Trump's comments come as he and other administration leaders reject an initial preliminary assessment that damages to the Iranian facilities set the country's program back just a few months rather than causing extensive damage.

"They presented a report that wasn't finished," he said about the report Wednesday. "We're talking about something that took place three days ago."

He further claimed that the intelligence community can only take "a guess" at the damages because "they didn't see it."

"If you take a look at the pictures, if you take a look at how it's all black, if you know the fire and brimstone is all underground because it's granite and it's all underground, you don't show it. But even there, with all of that being said, the whole area — for 75 yards around the hole where it hit — is black with fire," he said.

Meanwhile, International Atomic Energy Agency Director General Rafael Mariano Grossi has said that the agency does not know where some 900 pounds of enriched uranium from the sites are located.

"We do not have information of the whereabouts of this material," he said in an interview. "So this is why I'm asking. We are making an assumption, which is not speculative or pure speculation, because Iran officially told me, 'We are going to be taking protective measures, which may or may not include moving around this material.'"