White House directs Pentagon to let troops use force at border

CBS News' David Martin has obtained a memo signed by White House chief of staff John Kelly declaring troops may use force — including lethal force, if necessary — to protect federal personnel at the southern border. Secretary of Defense James Mattis, however, insists troops won't be armed with firearms.The memo, dated Tuesday, says troops at the border "may perform those military protective activities that the secretary of defense determines are reasonably necessary to ensure the pro