Kingspan is pursuing a refund of Trump tariffs through the US legal system after the president’s banner trade policy was deemed unlawful by the country’s Supreme Court. The Cavan-based multinational filed a case in the United States Court of International Trade against the “unlawful” tariffs, in advance of a separate portal being opened for the processing of refunds from authorities. It joins a long list of corporates and SMEs alike that are trying to get their money back. Early in his second term, US President Donald Trump unleashed a wave of tariffs against most countries, leaning on the powers of…