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Japanese markets were set to open lower open on Monday, while most markets in Asia were closed for holidays, as investors parsed the latest developments in the Middle East conflict over the weekend.

President Donald Trump on Sunday issued a fresh round of threats to attack Iran’s power plants and civilian infrastructure starting Tuesday if Tehran fails to fully reopen the Strait of Hormuz. The key chokepoint between Iran and the Arabian Peninsula normally handles about one-fifth of the world’s oil and gas supplies.

In an expletive-filled social media post, Trump also vowed to bring “Hell” to the country after U.S. forces rescued an American airman shot down in Iran last week.

He later posted about a “Tuesday 8 P.M. Eastern Time” deadline without elaborating. The White House on Sunday told MS NOW that the date is the new deadline for Iran to reach a deal with the U.S.