WASHINGTON (AP) — The U.S. is demanding that Iran make a public statement saying the Strait of Hormuz is open and that ships crossing the vital corridor won’t be attacked anymore, senior U.S. officials said Friday, adding that internal Tehran power struggles have made it difficult to reach and keep a deal.

The U.S. officials, who spoke on condition of anonymity to describe to reporters the state of play with Iran, said the resumption of strikes this week came after what they described as a rogue faction of Iranian hard-liners trying to sabotage the ceasefire between Tehran and Washington.

It comes as U.S. President Donald Trump reiterated on social media Friday that he views the interim ceasefire deal as “OVER!” But he said the U.S. would continue talks aimed at putting a permanent end to the war.

The officials said Friday that Trump is giving U.S. negotiators limited time to reach a deal with Iran, but, in a sign of the challenges ahead, they underscored that the president had a wide range of options if talks fall apart. They also said a power struggle was playing out in real time in Iran after U.S. and Israeli strikes at the start of the war killed its longtime leader, Ayatollah Ali Khamenei.

The U.S. is working on pressing Iran to make a public statement that the Strait of Hormuz, a vital waterway for world energy markets, is open and free to ships to transit, the officials said.

On a call with reporters, the officials suggested that leaders in Iran even told their U.S. counterparts that the ship strikes were a mistake and the country hoped to continue negotiations despite that.

Trump didn’t care that the firing on ships came from a hard-line faction and responded with more powerful counterattacks, showing Iran that there would be consequences no matter who was behind it, the officials said.

But moments before the U.S. officials spoke, Tehran’s diplomat at the United Nations told reporters that any activity in the Strait of Hormuz, including its opening or demining operations, “rests exclusively with Iran.”

“Any attempt, by external actors, to interfere with or establish a power arrangement would violate the (interim deal), and undermine its implementation, delay the restoration of normal commercial navigation, jeopardize maritime safety, and increase regional tensions,” Ambassador Amir Saeid Iravani said outside the U.N. Security Council.