The decision marks a significant escalation in trade policy and comes amid heightened tensions over presidential authority to regulate imports.

Following the ruling, President Trump signed a proclamation imposing a temporary 10% duty on imports under Section 122 of the Trade Act of 1974. The provision allows a president to set import restrictions for up to 150 days in response to trade imbalances or economic threats. Shortly thereafter, Trump confirmed that the rate would be raised further to 15%.

Despite the court’s decision, Trump argued that the ruling clarified rather than weakened presidential authority over trade policy. He described the outcome as making executive power “more powerful” and “more crystal clear rather than less,” while expressing disagreement with the Supreme Court’s reasoning.

The Supreme Court’s ruling dealt a major setback to the legal foundation of Trump’s tariff framework, raising questions about the durability of his broader economic agenda. However, the administration appears determined to pursue alternative statutory tools to maintain and expand tariff measures.

Economists warn that higher global tariffs could have ripple effects across supply chains, potentially increasing costs for consumers and businesses. Supporters of the move argue that stronger tariffs are necessary to protect domestic industries and reduce trade deficits.

Financial markets are expected to closely monitor developments as legal, political, and economic implications unfold in the coming weeks.

ACCRA, Sept. 10, 2025 — Ghanaian President John Mahama has strongly warned against escalating global trade tensions, declaring that “nobody wins tariff wars.” His remarks came during a Presidential Media Encounter held at the Jubilee House, where he addressed journalists on key economic issues and Ghana’s evolving role in the international trade system.

President Mahama expressed deep concern over the rise in unilateral tariffs, particularly those imposed by the United States, which he said threaten to unravel years of progress toward a rules-based global trade order.

“Trade wars only breed retaliation, market instability, and uncertainty for businesses. Nobody wins tariff wars,” Mahama stated.

AGOA Tariff Shifts Hit African Exporters

The president specifically cited the African Growth and Opportunity Act (AGOA), under which African countries like Ghana previously enjoyed zero-tariff access to U.S. markets. That advantage has now been eroded, with some exports facing tariffs as high as 15%, he noted.

“It is disheartening that African exporters are now being penalized after years of encouraging integration into global value chains,” he added.

In a striking comment, Mahama also linked the tariff hikes to systemic problems within the affected economies, saying:

“The reason for the high tariffs only means that a lot of people are not paying.”

Analysts interpreted this as a reference to challenges in tax compliance, trade transparency, or perhaps the need for revenue recovery through import levies.

Call for Market Diversification

President Mahama used the platform to urge African nations to diversify their export markets and reduce dependency on a few powerful trade partners.

“Africa must move beyond a single-market mindset. We need to strengthen intra-African trade under the AfCFTA and expand into Asia, Latin America, and other emerging markets.”

He reaffirmed Ghana’s commitment to the African Continental Free Trade Area (AfCFTA), highlighting the opportunity it presents to build a resilient, self-reliant African economy.

The Bigger Picture

Mahama’s warning comes amid growing tensions between major economies, particularly the U.S., China, and the EU, where tariff battles and trade realignments are increasingly common. For developing nations like Ghana, the effects of such disputes can be disproportionately damaging.

Key Takeaways:

• President Mahama calls trade wars “destructive” and urges diplomacy over protectionism

• African exporters face a new 15% tariff on some goods previously covered under AGOA

• Ghana advocates for diversifying export destinations and strengthening African trade blocs

• Global shifts require Africa to adopt a proactive trade strategy

Rome, Italy – Italian Prime Minister Giorgia Meloni has called on the European Union to do everything possible to avoid a trade war with the United States, warning that escalating tariffs could threaten billions in transatlantic trade.

Speaking during a joint press conference with Austrian Chancellor Christian Stocker in Rome, Meloni stressed the urgency of continued diplomacy between Brussels and Washington. “We must avoid a trade war at all costs,” she said, emphasizing that Italy and Austria support efforts to reach a mutually beneficial agreement before the looming August 1 deadline for potential U.S. tariff increases.

The U.S. is reportedly considering significant tariff hikes on a range of European goods in response to long-standing disputes over trade imbalances and subsidies, with key sectors like steel, agriculture, and automotive exports at risk.

“We are in close contact with the European Commission,” Meloni stated. “The goal is to preserve strong economic ties with our transatlantic partners without compromising European industry.”

Chancellor Stocker echoed the sentiment, underscoring the importance of EU unity in ongoing negotiations.

The EU and U.S. have faced renewed tensions over trade policy in recent months, raising concerns among business leaders and economists about potential disruptions to the global supply chain.

Washington, D.C. — In a bold move that has reignited fears of a renewed global trade war, former U.S. President Donald Trump has announced plans to impose 25% tariffs on major U.S. trading partners, including Japan and South Korea, should he return to office in 2025.

The proposed tariffs were outlined in formal letters sent to leaders in at least 14 countries, according to aides close to the Trump campaign. The letters, described by officials as “aggressive but open to negotiation,” also reached smaller exporters such as Serbia, Thailand, and Tunisia, marking a significant broadening of Trump’s earlier America-first trade doctrine.

Signals of Negotiation, But With Sharp Edges

Though the letters hinted at the possibility of future trade negotiations, they carried an unmistakable message: cooperation would be rewarded, but retaliation would trigger proportional countermeasures.

“If these nations choose to retaliate, they will face tariffs of their own,” one senior Trump adviser said on background. “President Trump is sending a clear message: the era of one-sided trade is over.”

This echoes Trump’s earlier moves during his 2017–2021 presidency, when similar tariffs were imposed on Chinese goods, sparking a prolonged trade war that disrupted global supply chains.

Japan and South Korea React

Tokyo and Seoul both key U.S. allies in the Indo-Pacific have responded with caution, indicating they are monitoring the situation closely but urging the U.S. to pursue dialogue over confrontation.

A spokesperson for the Japanese Ministry of Foreign Affairs said on Tuesday,

“We believe that open, rules-based trade is essential to global stability. Any policy shifts will be met with careful diplomatic engagement.”

South Korea’s Trade Ministry issued a similar statement, calling for “constructive discussions” and warning of the risk of market instability.

A Broader Trade Doctrine?

Analysts suggest the move is not simply about tariffs it could signal a broader shift toward isolationist economic policy under a potential second Trump administration.

“It’s not just about punishing trade deficits anymore,” said Helen Marwick, a senior fellow at the Global Economic Forum. “This is about reshaping alliances, redrawing supply chains, and asserting political influence through trade pressure.”

The inclusion of non-major exporters like Tunisia and Serbia in the letters also suggests a geopolitical strategy, targeting nations where the U.S. is seeking leverage across diplomatic and economic fronts.

Market Response and Global Outlook

Financial markets have already shown signs of unease. The Tokyo Stock Exchange fell 1.8% in early trading following the news, while the Korean won weakened slightly against the U.S. dollar.

The European Union, which was not among the countries named in the first batch of letters, said it was “closely watching developments” and reiterated its commitment to multilateral trade agreements under the World Trade Organization (WTO).

Conclusion

As the world braces for a possible resurgence of Trump-era trade wars, governments and corporations alike are weighing the potential costs of economic nationalism versus the realities of interdependence. Whether this move marks a negotiating tactic or the start of a deeper economic rift remains to be seen.

Earlier on Thursday, he had told reporters that he expected the first batch of letters to go out on Friday, a national holiday in the United States, but the date has since shifted. In a global trade dispute that has unsettled financial markets and triggered a rush among policymakers to protect their economies, he announced in April a 10% base tariff rate with additional amounts for most countries, some as high as 50%.

However, all but the 10% base rate were suspended for 90 days to allow more time for negotiations to secure deals. That suspension period ends on July 9, although early on Friday he said the tariffs could be even higher — ranging up to 70% — with most set to go into effect August 1.

“I signed some letters and they’ll go out on Monday, probably twelve,” he said, when asked about his plans on the tariff front. “Different amounts of money, different amounts of tariffs.”

Initially, he and his top aides planned to negotiate tariff rates with dozens of countries, but he has grown frustrated with that process following setbacks with major trading partners including Japan and the European Union. He briefly addressed this late on Friday, telling reporters: “The letters are better … much easier to send a letter.”

He did not address his earlier prediction that broader trade agreements might be reached before the July 9 deadline. The change in strategy reflects the difficulties in completing trade agreements covering tariffs and other barriers such as agricultural import bans, especially on an accelerated timeline. Most past trade agreements have taken years to negotiate.

So far, the only trade deals reached are with Britain, which secured a May agreement to keep a 10% tariff rate and won preferential treatment for sectors like autos and aircraft engines, and with Vietnam, cutting tariffs on many Vietnamese goods to 20% from the previously threatened 46%. Many U.S. products would be allowed duty-free entry into Vietnam.

A deal expected with India has not materialized, and EU diplomats recently said they have failed to make progress in trade talks with the administration and may now seek to extend the current situation to avoid tariff hikes.