After war broke out in Europe in 1939 Landon fought against isolationists such as America First who supported the Neutrality Act; he feared it would mislead Nazi Germany into thinking the United States was unwilling to fight. In 1941, however, he joined isolationists in arguing against lend-lease, although he did urge that Britain be given $5 billion outright instead. After the war, he backed the Marshall Plan, while opposing high domestic spending. After the communist revolution in China, he was one of the first to advocate recognition of Mao Zedong's communist government, and its admission to the United Nations, when this was still a very unpopular position among the leadership and followers of both major parties.