In the United States' pressure campaign against China, President Donald Trump's threshold for action is decreasing and his tolerance for risk of blowback to U.S. economic interests appears to be rising -- a trend confirmed by the White House's move to both restrict transactions by U.S. entities with China's TikTok and WeChat apps, as well as impose sanctions against Chinese and Hong Kong officials involved in the Hong Kong crisis. Such blowback includes the impact of U.S. restrictions on U.S. businesses in China, as well as the threat of Chinese retaliation. Although both of these moves are part of a long-term bipartisan trend towards greater confrontation with China, U.S. President Donald Trump's electoral challenges will lead to an increasingly volatile dynamic ahead of the November vote, even as he tries to walk the line of preserving, at least in name, the U.S.-China trade deal as a key campaign promise. ...