President Obama plans to nominate Charlotte Mayor Anthony Foxx to serve as transportation secretary, a White House official said Sunday. Foxx, who would succeed Ray LaHood, would be the first African American nominated to serve in the president’s second-term Cabinet. Obama, who has had several Latino, African American and female Cabinet members step down in recent months, has come under fire for not doing enough to ensure diversity among his top advisers. The White House official, who spoke on the condition of anonymity because the announcement had not been made, said, “As mayor of one of America’s most vibrant cities,...