Christine Lagarde, head of the European Central Bank, warned that President Trump's interference with the US Federal Reserve could pose a serious threat to the global economy. She emphasized the importance of the Fed's independence in maintaining economic stability. Trump has criticized Fed chair Jerome Powell and attempted to influence interest rate policies, aiming for significant cuts to boost growth. However, Lagarde noted that it would be challenging for Trump to exert control over the Fed due to legal constraints and the structure of its leadership.