(Reuters) – The U.S. Department of Justice on Wednesday sued Peter Navarro, an adviser to former President Donald Trump, seeking emails from his time in the White House that he has refused to return without a grant of immunity. The lawsuit, filed in U.S. District Court in Washington, D.C., centers on Navarro’s use of a personal ProtonMail for some official White House business. Mr. Navarro is wrongfully retaining presidential records that are the property of the United States, and which constitute part of the permanent historical record of the prior administration,” Justice Department attorney…