President Trump announced Sunday afternoon that Homeland Security Secretary Kirstjen Nielsen "will be leaving her position" after 16 months in the job. Trump also announced that U.S. Customs and Border Protection (CBP) Commissioner Kevin McAleenan will replace Nielsen as acting secretary, tweeting: "I have confidence that Kevin will do a great job!" ... Nielsen's departure is the latest staffing shakeup in the department, which was founded to combat terrorism after the Sept. 11, 2001 terror attacks. On Friday, Trump confirmed he had withdrawn the nomination of acting Immigration and Customs Enforcement (ICE) Director Ron Vitiello to become the permanent head...