Donald Trump has asked a Miami federal judge to deny the BBC permission to serve subpoenas on three family members by certified mail. The fight sharpens a high-stakes defamation case over a January 6 speech edit as trial preparations continue.

President Donald Trump has urged a federal judge to reject the BBC’s request for the court’s help in securing testimony and documents from three members of the president’s family in response to his $10 billion defamation lawsuit against the British...