Department of Homeland Security Secretary Alejandro Mayorkas said Sunday on CBS’s “Face the Nation” that the federal government was not notified about previous arrests by the suspect in the murder of Laken Riley, a 22-year-old nursing student. Partial transcript as follows: MARGARET BRENNAN: I want to ask you about a- a criminal case that has become a political rallying point. You heard Donald Trump use this phrase, “migrant crime”. A 22 year old nursing student—I know you’ve been following this—Laken Riley, in the state of Georgia, was murdered allegedly by an undocumented Venezuelan migrant. The suspect had been detained by...