Trump also said he would state in the speech, which is due at 9 pm EDT on Wednesday (0100 GMT on Thursday), that he was considering withdrawing the US from the NATO alliance.
Asked when the United States would consider the Iran war over, Trump said: “I can’t tell you exactly … we’re going to be out pretty quickly.”
US action has ensured Iran will not have nuclear arms, he said: “They won’t have a nuclear weapon because they are incapable of that now, and then I’ll leave, and I’ll take everybody with me, and if we have to, we’ll come back to do spot hits.”
TRUMP SAYS HE IS CONSIDERING QUITTING NATO
Global oil supplies are expected to be hit twice as hard this month as in March, the International Energy Agency said on Wednesday, underlining the urgent need for an end to the conflict Trump began with Israel on February 28.
Trump said separately on social media that Iran had asked for a ceasefire but that he would not consider it until Tehran ceased blocking the Strait of Hormuz, a major fuel shipment route. Iran denied any such request.
Two security sources from Pakistan, which is mediating in the conflict, earlier told Reuters Islamabad had proposed a temporary ceasefire to both sides but had not heard back from either.
Trump signalled on Tuesday he could wind down the war in two to three weeks even without a deal and scaled up threats to pull the US out of the NATO defence alliance if European states did not help stop Iran threatening the waterway.
In his remarks to Reuters, Trump said he would express his disgust with NATO for what he considers the alliance’s lack of support for U.S. objectives in Iran. He said he is “absolutely” considering an attempt to withdraw the United States from NATO.
European states took pains to appear unruffled and France’s junior army minister Alice Rufo said operations by NATO in the Strait of Hormuz would be a breach of international law.
