The US junk bond rally came to a halt on Friday with the biggest one-day loss in six months, as the risk premium surged to near a four-month peak of 304 basis points. Yields climbed to 6.99%, the highest in more than two months.The losses accelerated after President Trump threatened to impose huge tariffs on imports from China and said he saw no reason to meet with Chinese President Xi Jinping, causing concerns about trade relations between the world’s two biggest economies....