President Donald Trump speaks at US Steel Corporation's Mon Valley Works-Irvin plant.Donald Trump’s tariffs have been blamed after experts warned the UK’s economy will grow more slowly than previously thought.The Organisation of Economic Cooperation and Development (OECD) think-tank said “heightened trade tensions” were leading global uncertainty.They said the UK’s gross domestic product (GDP) will now grow by 1.3% this year, down from their previous forecast of 1.4%.It also downgraded its forecast for GDP growth in 2026 from 1.2% to just 1%.The findings are a major blow for Rachel Reeves after Labour made improving economic growth its top priority.Although the UK economy grew by a higher-than-expected 0.7% in the first quarter of this year, the OECD said that “momentum in weakening” as business sentiment deteriorates.Keir Starmer last month agre