April 4, 2025, emerged as a day of profound upheaval across global financial markets and political landscapes, marked distinctly by aggressive trade action from the United States and a landmark constitutional ruling in South Korea. US President Donald Trump’s newly enacted “Liberation Day” tariff initiative triggered a sharp decline in stock values worldwide, erasing trillions from market capitalisation. Simultaneously, South Korea’s top court delivered a decisive blow to the country’s leadership, upholding the impeachment of President Yoon Suk Yeol.
Markets Reel from “Liberation Day” Tariffs
The immediate and most visible impact of the “Liberation Day” tariffs was felt across major stock exchanges. The initiative, unveiled by the Trump administration, prompted a rapid sell-off that resulted in approximately $3.5 trillion in market capitalization being wiped from listed companies in Japan, Europe, and the US. This sharp contraction marked the worst day for these major stock markets since March 16, 2020, during the early phase of the global pandemic.
Benchmark indices reflected the widespread panic. In Tokyo, the Nikkei Stock Average dropped a significant 2.8%. Markets in Southeast Asia also saw declines, with Singapore’s ST and Vietnam’s VN sliding by similar percentages. European equities followed suit, as the regional STOXX index fell 3%. Across the Atlantic, the downturn was even more severe, with the Dow Jones Industrial Average experiencing a precipitous 4% tanking.
US Administration Defends Policy Amid Business Backlash
Despite the widespread market disruption, the US administration defended the new tariff regime. US Commerce Secretary Howard Lutnick characterized the move not as punitive protectionism but as a necessary “reordering of fair trade.” Speaking shortly after the markets closed, Secretary Lutnick expressed anticipation that other nations would be compelled to reassess and adjust their trade policies vis-à-vis the United States in light of the new economic landscape created by the tariffs.
However, the business sector quickly registered its concern and began taking responsive measures. Global automotive giant Stellantis announced significant layoffs, impacting 900 workers across five plants. The company also temporarily paused production activities in its facilities located in Mexico and Canada, citing the economic uncertainty and altered trade dynamics brought about by the new tariffs.
South Korean President Impeached by Constitutional Court
Concurrently with the economic turbulence emanating from Washington, South Korea faced a profound political crisis culminating in a historic judicial decision. The country’s Constitutional Court delivered a unanimous vote to remove President Yoon Suk Yeol from office. The ruling upheld parliament’s earlier impeachment motion against the embattled leader.
The court’s decision stemmed directly from President Yoon’s short-lived imposition of martial law. This controversial measure was widely seen as an attempt to undermine constitutional institutions, triggering the nation’s worst political crisis in decades and sparking massive public protests across the country. The court found that the President’s actions constituted a grave violation of his constitutional duties.
President Yoon Suk Yeol’s removal from office is immediate, effective from the moment of the Constitutional Court’s ruling. The national election commission is now expected to announce the date for a new presidential election in the near future, paving the way for a potential shift in South Korea’s leadership and political direction following a period of intense instability.
Legislative Challenges and Legal Battles Emerge in US
Amidst the executive action on tariffs, parallel developments were unfolding within the US legislative and judicial branches that could potentially constrain presidential authority on trade matters in the future. Separately introduced, a newly proposed bipartisan Senate bill aims to limit President Trump’s authority to impose tariffs without explicit congressional approval. The bill reflects a growing sentiment among some lawmakers from both major parties that tariff imposition powers should be subject to greater checks and balances.
Adding another layer of challenge, the New Civil Liberties Alliance (NCLA), a non-profit civil liberties group, has filed a lawsuit seeking to block tariffs on China specifically. The NCLA argues that the administration’s justification for imposing these tariffs relies upon an unlawful invocation of emergency powers, contending that the specific circumstances do not meet the necessary legal threshold for such extraordinary executive action. These legislative and legal challenges signal potential future battles over the scope of presidential power in setting US trade policy.
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