In the final two years of a US presidency, when Congress has been lost, approval ratings have sunk like a stone and their party has started to think about who’s coming next, the person occupying the Oval Office can feel their power draining away. Domestic legislation, particularly in an era where bipartisan cooperation is almost nonexistent, grinds to a halt. But as the days tick by until the end, and as presidents begin to think about their legacy, there is one part of the job where they still have power:…