Trump Lauds China's Role in Iran Truce While Threatening 50% Tariffs on Weapons Suppliers; Legal Authority Unclear After IEEPA Ruling

In a notable diplomatic contradiction on April 9, Trump praised China's contribution to facilitating the US-Iran ceasefire even as his Truth Social post threatening 50% tariffs on nations supplying Iran with weapons was widely understood to target Beijing and Moscow. South China Morning Post reported Trump's dual messaging — crediting China as a positive actor in the ceasefire while simultaneously threatening its goods with punitive 50% tariffs if found to be supplying Iran with weapons. Legal scholars noted Trump had not cited a specific legal authority for the tariff threat — the Supreme Court's February 2026 ruling struck down his primary tool (IEEPA) for broad emergency tariffs. Alternative legal grounds (Section 301, Section 232) are narrower and would require formal investigations. The tariff threat added a new dimension of unpredictability to US-China trade relations, already strained by 145% cumulative US tariffs on Chinese goods and China's 34% retaliatory tariff on all US imports.