WASHINGTON — US President Donald Trump said on Wednesday that the deal announced with Iran this week is a “memorandum of understanding” and remains subject to change.“If I don't like it, we'll go back to shooting at them,” Trump told reporters during a meeting with Egyptian President Abdel Fattah al-Sisi.He warned that if Iran's leaders “don't behave,” the United States will resume “dropping bombs” on their territory.Washington and Tehran reached a temporary truce in April through Pakistani mediation before announcing a framework agreement on Monday to end the conflict. The accord is expected to be formally signed in Switzerland on Friday.Trump said the core objective of the deal is preventing Tehran from obtaining nuclear weapons.“It's a great deal for a lot of reasons, but number one, by far, 99.9%, is they will never have a nuclear weapon,” he said, describing the pact as “very strong.”The US president also rejected reports of a $300 billion development fund accessible to Iran involving American taxpayers, calling them a “false story.”“We're not investing. We're not putting up 10 cents,” Trump said, adding that others may choose to invest.“I would say they won't be doing it for a while, until they find out about the behavior of Iran,” he added.Addressing the global economic impact of the conflict, Trump said oil prices have “come tumbling down” as markets react to the de-escalation.He also said the Strait of Hormuz is “already partially opened” and expects the strategic waterway to be fully operational within the next two days.Trump argued that without a deal, the world would have faced a “depression” because the strait would have remained closed due to the threat of rockets and mines.