First Thing: Trump welcomes Xi to Washington amid tensions over trade, AI and Taiwan

State visit takes place at same time as UN general assembly, which Chinese leader has avoided. Plus, meet the people who are real-life Pokémon ‘professors’ Good morning. Donald Trump has welcomed Xi Jinping to the US, greeting the Chinese leader on the tarmac at Joint Base Andrews at the start of his state visit. Xi’s trip coincides with the UN general assembly in New York, but he is not attending…