Tehran received a message from President Trump warning that a retaliatory attack was imminent after Iran shot down a US drone — but saying he was against war and wanted to hold discussions, according to a report.

“In his message, Trump said he was against any war with Iran and wanted to talk to Tehran about various issues,” an Iranian official told Reuters, speaking on condition of anonymity.

“He gave a short period of time to get our response but Iran’s immediate response was that it is up to Supreme Leader (Ayatollah Ali) Khamenei to decide about this issue,” the source said.

The message from Trump was delivered overnight through Oman, Reuters reported.

Another Iranian official said: “We made it clear that the leader is against any talks, but the message will be conveyed to him to make a decision.”

“However, we told the Omani official that any attack against Iran will have regional and international consequences,” the official added.

News of the message came hours after the New York Times reported that Trump had ordered a missile strike against Iran before abruptly calling it off.

In a tweet, Trump reacted to the downing of the RQ-4A Global Hawk by declaring that “Iran made a very big mistake!”

But he also played down the incident by saying it appeared to have been “a big mistake” by some “loose and stupid” Iranian.

“I find it hard to believe it was intentional,” the president told reporters in the Oval Office during a meeting with Canadian Prime Minister Justin Trudeau.

Iran acknowledged that it shot down the drone, saying the craft had strayed into the nation’s airspace. The US insists it was over international waters.