By Michael Martina and Jason LangeWASHINGTON (Reuters) - Bipartisan majorities of Americans favor more tariffs on Chinese goods and believe that the United States needs to step up preparations for military threats from the country, according to a new Reuters/Ipsos survey. Another 66% of respondents - including 58% of Democrats and 81% of Republicans - agreed with a statement that the United States "needs to do more to prepare for military threats from China." The bipartisan concern about China helps explain the increasingly combative stances Republican presidential candidates have taken toward the world's second-largest economy. The online Reuters/Ipsos poll was conducted nationwide, collecting responses from 1,005 adults, including 443 Democrats and 346 Republicans. Seventy-five percent of Americans had a negative view toward China, while 84% saw Xi at least slightly unfavorably.