President Donald Trump said the United States has drawn up a sweeping military plan that would wipe out Iran’s key infrastructure within hours if Tehran refuses to meet American demands.

Speaking about the potential operation, Trump described a scenario in which U.S. forces would carry out a rapid and devastating series of strikes targeting bridges and energy facilities across the country.

“We have a plan… where every bridge in Iran will be decimated by 12 o’clock tomorrow night, where every power plant will be out of business, burning, exploding and never to be used again, I mean, complete demolition, by 12 o’clock, and it will happen over a period of four hours if we want that to happen,” he says.

He made clear that such a course of action is not his preferred outcome, noting that the U.S. could ultimately play a role in rebuilding Iran.

“We don’t want that,” he adds, noting that the US may end up helping Iran rebuild, in which case, he would not want to have to reconstruct expensive infrastructure like that.

Trump said Iran previously failed to take his warnings seriously, which he indicated led to a recent strike on a major structure in Tehran after negotiations collapsed.

“Do I want to destroy their infrastructure? No. It would take them 100 years to rebuild,” he says.

He argued further that Iran’s recovery would depend heavily on American involvement.

“If we left today, it would take them 20 years to rebuild their country… and the only way they’re going to be able to rebuild their country is to utilize the genius of the United States of America,” he claims.

Asked about the future of the Strait of Hormuz, Trump floated the idea that the U.S. could impose tolls on shipping routes, before appearing to soften that suggestion.

“Why shouldn’t we? We’re the winner. We won. They are militarily defeated,” he says.

He later appeared to back off the idea.

“We have to have a deal that’s acceptable to me, and part of the deal is going to be that we want free traffic of oil and everything else,” he says.