President Donald Trump has set deadlines, made demands and issued threats over the course of the five-week joint US-Israeli war against Iran. But seldom have they been this explicit.

The new round of strikes against Iran will be devastating. They will begin at 20:00, Washington DC time (01:00 GMT) on Tuesday. Within four hours, every bridge and power plant in the nation will be decimated.

Very little is off-limits, Trump said on Monday.

To avoid this fate, according to the president, Iran has to make a deal that's acceptable to me. A component of the agreement should include free traffic of oil through the Strait of Hormuz.

As the final hours tick down, there has been little indication that Iran is ready to agree to Trump's ultimatum. They've rejected a temporary ceasefire and issued their own list of demands, which a US official described as maximalist.

This places the American president in a delicate position. If there is no agreement, Trump could extend his deadline – for the fourth time in the past three weeks. But backing away after such detailed threats could undercut his credibility as the war grinds on.

It’s possible Iran, and the rest of the world, could conclude that despite America's military might, it is not negotiating from a clear position of strength.

During a press conference, Trump insisted, We won. They are militarily defeated. The only thing they have is the psychology of: 'Oh, we're going to drop a couple of mines in the water'.

That psychology – the ability to deter oil tankers from transiting the Strait of Hormuz with drones, missiles and mines – may be a more potent Iranian asset than the US has been willing to acknowledge.

While Trump claimed that anything the US destroys now would eventually have to be rebuilt, he acknowledged that the humanitarian crisis resulting from continued military action could be devastating.

Even in this late hour, however, Trump continues to hold out hope for a breakthrough. We have an active, willing participant on the other side, he stated, while allowing that negotiations might be more progress than publicly acknowledged.

With high stakes ahead, the president has made his position clear: They have till tomorrow. We'll see what happens. I believe they're negotiating in good faith. I guess we'll find out.\