(AP) – U.S. President Donald Trump has discussed a timeline for the fighting in Iran during a phone interview with a British newspaper.

“We figured it will be four weeks or so,” Trump told the Daily Mail. “It’s always been about a four-week process, so, as strong as it is — it’s a big country — it’ll take four weeks, or less.”

The U.S. military said three service members have been killed, the first known American casualties from the conflict. Trump called those killed “great people.”

“You know, we expect that to happen, unfortunately,” Trump told the newspaper. “Could happen continuous — it could happen again.”