Trump threatens extra 50% tariff on China, opens door to talksBen BerkowitzPresident Trump at the White House. Photo: Andrew Harnik/Getty ImagesPresident Trump on Monday threatened to impose an extra 50% tariff on China, but opened the door to talks with other nations on a path to lowering their tariffs.Why it matters: The administration's steadfast message in recent days has been that the tariffs were coming and there was no way out.Now, it appears there may be a glimmer of hope. Stock markets ...