A retired Army lieutenant colonel and Fox News contributor quit the network Tuesday, accusing it of fueling paranoia among its audience and serving as a “propaganda machine” for the Trump administration. Retired Lt. Col. Ralph Peters, a “strategic analyst” at Fox News, made the comments in an email to colleagues announcing that he had not renewed his contract, obtained by BuzzFeed. “Four decades ago, I took an oath as a newly commissioned officer. I swore to ‘support and defend the Constitution,’ and that oath did not expire when I took off my uniform. Today, I feel that Fox News is...