By Stanley White TOKYO (Reuters) – Japanese officials said on Tuesday there was still a significant way to go before reaching a broad agreement on trade with the United States, a day before President Barack Obama visits for a summit. A U.S.-Japan agreement is critical to the U.S.-led Trans-Pacific Partnership (TPP), a 12-nation grouping that would stretch from Asia to Latin America. A TPP deal is central to Obama’s policy of expanding the U.S. presence in Asia. Japanese Prime Minister Shinzo Abe has also touted the TPP as a main element of his economic strategy to increase growth and shake off years of stagnation.