President Trump and his top aides insist they are not seeking war, but the measures they have adopted in the past month — including an attempt to shut down all Iranian exports of oil, as well as steel, copper and other products — appear to have brought them perilously close to it. Facing an economic crisis, the Islamic republic has predictably responded by threatening to resume high-level enrichment of uranium — the most dangerous activity stopped by the nuclear deal that Mr. Trump unwisely scrapped.

According to U.S. officials, Tehran also may be preparing strikes against U.S. forces in the Middle East or against commercial and military ships in the Persian Gulf. Attacks on four oil tankers near the mouth of the gulf on Sunday have not yet been attributed to Iran; Secretary of State Mike Pompeo said Tuesday they were still being investigated. If Tehran is deemed responsible, Mr. Trump will come under pressure to deliver on threats of “a bad problem for Iran if something happens,” as he put it Monday. The Pentagon has dispatched additional forces to the region, and the New York Times reported that plans have been drawn up to send tens of thousands more U.S. troops.

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The Times also reported on U.S. intelligence that Iran may be seeking to provoke Mr. Trump into a military action. If so, it’s not hard to see why. The United States is poorly prepared for another conflict in the region; it has the support of none of its NATO allies, not even — as Mr. Hunt made clear — Britain. The use of force probably would not stop Iran from resuming its nuclear program or force a change of regime, short of a full-scale military invasion. That would find scant support from Americans, and for good reason: Until Mr. Trump began his escalation, Iran was observing the nuclear deal and did not pose an imminent threat to the United States.

Mr. Trump says he’s interested in negotiating with the regime of Ayatollah Ali Khamenei, but it’s not clear his top aides agree with him; they have laid out a series of demands they know Tehran will not meet. Mr. Pompeo conceded the other day that the U.S. strategy was unlikely to coerce Iranian leaders into concessions, but suggested that “what can change is, the people can change the government.” But the United States has been waiting in vain for a popular revolution in Tehran for decades.

As we pointed out previously, Mr. Trump is in danger of being cornered into choosing between a counterproductive use of force and allowing Iran to cross red lines. The way out is to return to diplomacy, in concert with European allies. The president should curb his hawkish aides and take that course before it is too late.