China fired a warning shot at President Biden when a Chinese-American bank supplied Senate Republicans with records showing millions of dollars flowing from Chinese companies to Mr. Biden’s son Hunter Biden and brother James Biden, said a lawmaker spearheading an investigation of the first family. Cathay Bank, which is based in Los Angeles but has offices in China, voluntarily turned over bank records requested by Sens. Ron Johnson of Wisconsin and Charles E. Grassley of Iowa. Every other American bank denied the two Republicans’ requests for financial records. “In my mind, it’s the Chinese government telling Joe Biden, ‘We got...