In the months that he has served as President TrumpÂ’s acting secretary of defense, Patrick Shanahan has worked to keep domestic violence incidents within his family private. His wife was arrested after punching him in the face, and his son was arrested after a separate incident in which he hit his mother with a baseball bat. Public disclosure of the nearly decade-old episodes would re-traumatize his young adult children, Shanahan said. On Tuesday, Trump announced in a tweet that Shanahan would not be going through with the nomination process, which had been delayed by an unusually lengthy FBI background check,...