Richard V. Spencer, President Trump’s ousted former Navy secretary, endorsed on Friday the opposing White House campaign of Democratic candidate Michael R. Bloomberg. Mr. Spencer, who was asked to resign in November amid a dispute involving retired Navy SEAL and convicted war criminal Edward R. Gallagher, stumped for Mr. Bloomberg during a campaign event held in Virginia shortly after his support was announced on the candidate’s official website. Speaking near a naval base in Norfolk, Mr. Spencer touted the billionaire media mogul and former New York City mayor for having characteristics crucial to running the country. We need a leader...