Asian shares tumbled again on Monday from fears of a trade war between China and the United States. Japan's Nikkei stumbled 0.9 percent to a near six-month low in early trade. While Morgan Stanley Capital International's broadest index of Asia-Pacific shares outside Japan slipped for its fourth consecutive day. Hong Kong's stock market opened down Monday morning with the benchmark, the Hang Seng Index, losing 30 points. US President Donald Trump announced last week he will impose tariffs on $60 billion of imports from China.