Karen Pierce

The provided news articles focus on UK politics, specifically concerning Keir Starmer's actions and statements regarding international relations and potential appointments. Karen Pierce is not mentioned in either article. Therefore, it's impossible to provide a summary about her based on the given information. The articles discuss attempts by Trump's aides to block Peter Mandelson's potential appointment as UK ambassador to the US and Starmer's assurance that the UK will avoid being drawn into a wider war over Iran. These events highlight the UK's current diplomatic challenges and its stance on international conflicts, but they do not relate to Karen Pierce.