"I’m in deciding mode."

Fox News senior correspondent Eric Shawn reports President Trump is weighing his next move on Iran as he prepares to meet with Persian Gulf leaders on the sidelines of the U.N. General Assembly Tuesday.

"My question is, if and when do I blow the entire nation up? They better behave," Trump tells Fox News as he weighs military action, continued economic pressure or another attempt at a deal.

The warning comes as tensions escalate across the region. Iran is threatening retaliation against U.S. interests if Washington launches new attacks, while Iran-backed Houthis have fired missiles at Saudi Arabia.

Trump also says he is open to meeting Iranian President Masoud Pezeshkian this week, but right now, no meeting between the two leaders is on the schedule.

Follow the Fox News live blog for the latest developments from the U.N. and across the Middle East: https://www.foxnews.com/live-news/iran-war-donald-trump-strait-of-hormuz-09-21