US Republican Senator Steve Daines, a close aide to President Donald Trump and a key interlocutor between Washington and Beijing, has called on the two capitals to stay engaged and “not retreat” over differences on issues including rare earth supply chains. Daines told the South China Morning Post that both sides still had issues that predated Chinese President Xi Jinping’s state visit to Washington last week and that they would continue working on them after the summit. “So that’s again why...