British sportswear retailer JD Sports posted a 2% fall in first-quarter underlying sales and warned that higher prices in its key U.S. market from President Donald Trump's tariffs could hit customer demand. JD, which makes nearly 40% of its sales in the United States through its Finish Line, Shoe Palace and Hibbett brands, warned in April that profits would only grow slightly, if at all this year, even before any potential impact from tariffs. The company is facing headwinds from a promotional market, worries over consumer spending and a drop off in demand for Nike products, which account for 45% of its sales.