BEIJING (Reuters) - Chinese President Xi Jinping and U.S. President Donald Trump have been in continuous touch through "various means", China's Foreign Ministry said on Monday, when asked when and where the two leaders might meet to ink a trade deal.Trump on Friday suggested he could sign a long-awaited trade agreement with China in the farm state of Iowa, which has been hard hit by tariffs in a nearly 16-month trade war between the world's largest economies.Trump said on Friday evening that..