U.S. President Donald Trump has been increasingly making Beijing's handling of the coronavirus outbreak a major issue for his November re-election campaign. This week he claimed to have seen evidence linking a Wuhan lab to the virus, contrary to the belief of many of the world's leading scientists. He went on to threaten China with fresh tariffs to compensate Washington for the costs of the pandemic, triggering another sell-off in global financial markets over fears of another trade war.