BEIJING/WASHINGTON (Reuters) - U.S. President Donald Trump and Chinese officials said Friday that they have agreed to a "phase one" trade deal that included cutting U.S. tariffs on Chinese goods. But they offered no specific details on the amount of U.S. agricultural goods Beijing had agreed to buy, a key sticking point of the lengthy deal negotiations. "We have agreed to a very large Phase One Deal with China," Trump said on Twitter Friday morning. Officials in China have "agreed to many..