<h1>Nippon Steel and US Steel sue Biden administration over blocked $15B acquisition, alleging political motives and due process violations.</h1> Nippon Steel and US Steel have filed a federal lawsuit against the Biden administration for blocking a nearly USD 15 billion acquisition of US Steel by Nippon. The lawsuit, submitted to the US Court of Appeals for the District of Columbia, claims the decision was politically motivated and violated due process. Nippon had pledged a USD 2.7 billion investment in US Steel's operations and assured no reduction in US production capacity without government approval. President Biden blocked the deal, citing national security concerns, following a deadlock by federal regulators and a report from the Committee on Foreign Investment in the United States.