Jamieson Greer

The provided news articles do not mention anyone named Jamieson Greer. Therefore, it is impossible to provide a summary about their background, newsworthiness, recent events, or relevance based on the given information. The articles focus on US trade relations with Canada, China, and the UK under President Trump, covering topics such as tariffs, electric vehicle deals, and pharmaceutical trade agreements. Without any mention of Jamieson Greer, any attempt to create a summary about them would be purely speculative and inaccurate.