President Donald Trump warned Iran that time is running out to make a deal with the U.S., noting that a fleet of U.S. warships entering to the region is ready to complete their mission “with speed and violence.”

Trump said in a social media post that he wants Iran to come to the table and negotiate a “fair and equitable deal — NO NUCLEAR WEAPONS,” and said an attack would be far worse than the strikes Trump ordered on Iran’s nuclear program last June.

Trump has repeatedly warned Iran that the U.S. might launch another attack on the country, but those threats were linked to a deadly crackdown on protests that began in late December. Trump has previously said Iran’s nuclear program was “obliterated” in the June strikes.

Trump’s latest post sent crude prices to session highs.

On Monday, Iran’s semi-official Iranian Students News Agency reported that Foreign Minister Abbas Araghchi and U.S. Special Envoy Steve Witkoff are exchanging messages on an “informal” basis. Several countries have offered offered to mediate between the U.S. and Iran in the wake of escalating tensions.

Speculation that another U.S. attack may be imminent grew after the USS Abraham Lincoln aircraft carrier and its associated strike group entered the region in recent days.

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