Acting U.S. Defense Secretary Patrick Shanahan said Tuesday he will step down due to a "painful and deeply personal family situation."President Donald Trump announced Shanahan's departure in a Twitter post, and said he will name Army Secretary Mark Esper to be the new acting Pentagon chief.Shanahan has asked to be withdrawn from his nomination for defense secretary, Trump said, with U.S. media reporting acts of domestic violence involving Shanahan's family in and around 2010."Acting Secretary of Defense Patrick Shanahan, who has done a wonderful job, has decided not to go forward with his c…READ FULL ARTICLE