President Donald Trump said Monday that the military campaign against Iran is largely finished, describing the conflict as nearly concluded more than a week after the United States initiated Operation Epic Fury, a major offensive aimed at Iran’s political leadership and military infrastructure.

In a phone interview with CBS News, Trump indicated that the fighting may soon come to a close.

“I think the war is very complete, pretty much,” he said. “They have no navy, no communications, they’ve got no air force.” He added that the U.S. is “very far” ahead of his initial four-to-six-week timeline.

The American operation began on Feb. 28 and was carried out in coordination with Israel. During the opening phase of the campaign, Iranian Supreme Leader Ayatollah Ali Khamenei was killed.

Asked about Iran’s new leader, Mojtaba Khamenei, the son of the late supreme leader, Trump said he had no message for him. “I have no message for him. None whatsoever.” He added that he has someone in mind to replace Khamenei but did not elaborate.

Trump also addressed developments in the Strait of Hormuz, the vital shipping lane used by a large portion of the world’s oil tankers. He said vessels are continuing to pass through the strait despite earlier Iranian threats to target ships in the area, adding that he is “thinking about taking it over.”

The president concluded with a warning directed at Iran.

“They’ve shot everything they have to shoot, and they better not try anything cute or it’s going to be the end of that country,” he said.