Donald Trump’s ally and US Senator Lindsey Graham says the US president is “deadly serious” about his ultimatum on the Strait of Hormuz.

“It is still my hope [the] Strait of Hormuz can be reopened and the enriched uranium can be secured through diplomacy,” Graham wrote in a post on X.

“That would be the best outcome for the region and the world. To say the window on diplomacy is closing would be an understatement.”