WASHINGTON U.S. President Donald Trump doubled down on April 5 on sweeping tariffs he unleashed on countries around the world, warning Americans of pain ahead, but promising historic investment and prosperity. The comments came as Trump's widest-ranging trade measures took effect in a move that could trigger retaliation and escalating economic tensions, with the British and French leaders saying "nothing should be off the table" in response. Trump, acknowledging global turbulence, urged