Jimmy Lai, seen nearly two years ago, was a key figure in the protests against China’s tightening of its authority over Hong Kong. HONG KONG—Chief executive John Lee said he would seek Beijing’s intervention after Hong Kong’s top court ruled against the government in a national security case involving pro-democracy newspaper tycoon Jimmy Lai . The Court of Final Appeal on Monday rejected a government bid to stop a senior lawyer from the U.K. representing Mr. Lai at his coming trial on collusion charges, backing decisions by lower courts.

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