It's not too hard to figure out why Franks might be hesitant at joining Flake and McCain at an immigration event. Franks, if he runs, would logically focus on immigration to attack Flake -- but if he showed up alongside him at a border security event, it could be use to blunt any suggestion that the differences between the two on immigration are that significant. The dynamic between the two Republican congressmen is worth watching closely over the next weeks. Another sign of tension: an "adviser to a potential GOP challenger" (read: Franks) sent Politico a televised clip of Flake criticizing proposals to deport illegal immigrants on CNN.
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