Trump’s 50% Tariff Threat—From Negotiation Leverage to Legal Dilemma

Just 8 minutes after the ceasefire agreement between the U.S. and Iran was announced, Trump posted a major policy on social media: any country that provides military weapons to Iran will face a “50% immediate tariff on ‘any and all goods’” sold to the United States, and he said the measure would be “effective immediately,” with “no exclusions or exemptions.”

The timing of this threat is worth pondering. The White House had just announced that its 38-day “Epic Fury” military operation had achieved three major goals: destroying Iran’s ballistic missile and drone capabilities, weakening naval forces, and striking the defense industry’s base. Trump then immediately added more leverage at the negotiating table, making it clear he wanted to capitalize on the momentum.

Analyzing the situation, Lip-ski, vice chairman of the Atlantic Council, said this 50% tariff threat is aimed directly at Russia and a certain great power—two countries repeatedly cited by Western media as major “military aid providers” to Iran. On April 9, Chinese Foreign Ministry spokesperson Mao Ning responded at a routine press conference: China has consistently called for stopping the fighting and bringing about a ceasefire as soon as possible, and for resolving disputes through political and diplomatic channels. China hopes that all parties can properly address differences through dialogue and negotiations, and will continue working to ease tensions and calm the flames of war.

However, this tariff threat faces serious legal challenges at the implementation level. Recently, the U.S. Supreme Court ruled that Trump’s approach of using the International Emergency Economic Powers Act (IEEPA) to construct a new tariff framework violates the U.S. Constitution, which directly undermines his ability to unilaterally roll out such tariffs without authorization from Congress.

But this does not mean the tariff threat is a “blank check.” Analysts point out that although the Supreme Court overturned the IEEPA tariff tool, the White House can still make the threat materialize through alternative measures such as Section 232, Section 301 investigations, and more. In an interview with Sky News UK, Trump said that militarily, “everything he wanted to do has already been done,” that “the U.S. has achieved complete victory militarily,” but that if negotiations do not go smoothly, “the U.S. military can resume operations at any time.” Trump’s finesse lies in tying the military ceasefire to tariff sanctions, forming a three-pronged strategy of “military pressure + diplomatic negotiations + economic sanctions.”

At the same time, Trump is also pushing to ease sanctions. He said the U.S. will work closely with Iran to discuss matters related to lifting tariffs and sanctions. Many of the contents in his “15-point plan” have already reached consensus. Iran will not conduct uranium enrichment activities, and the U.S. will work with Iran to dig up and clear all deeply buried nuclear “dust.” This is one of the clearest official signals of easing from the U.S. since it withdrew from the Joint Comprehensive Plan of Action in 2018.

Meanwhile, Trump continues to strengthen deterrence through a military presence in Iran. In a post on social media, he wrote that all U.S. ships, aircraft, and military personnel “will continue to be stationed inside Iran and in the surrounding regions until the agreement reached is fully complied with,” and warned that “if compliance fails for any reason, the flames of war will be rekindled, and their scale will be far larger than anything anyone has seen before.”

Trump is also pushing on multiple fronts simultaneously. After meeting with the visiting NATO Secretary General, Rut te, he posted a criticism of NATO as a “paper tiger,” and again brought up the issue of Greenland. He said that “NATO is not there when we need them, and if we need them again, they also won’t be there,” indicating that he is considering withdrawing from NATO because the U.S. is seeking Greenland, but NATO allies have refused.
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