Rubio’s troubles with immigration have come up again and again. His status as a member of the “Gang of Eight” has haunted him at every turn. Tonight he tried to pivot the whole issue towards national security and the supposed influx of “crazies.” Rubio said, “First and foremost, this issue has to be more than anything else about keeping America safe.” He tried to land some punches on Ted Cruz, his most vocal critic on his immigration record, calling out flip-flops on several key points of contention: green cards, guest workers, legal status, and birthright citizenship. Cruz immediately contested these points and brushed off Rubio’s shift to terrorism, recalling that “Rubio-Schumer amnesty bill.” These immigration barbs between Rubio and Cruz are getting repetitive, so we can probably count on hearing them again at the next debate.