You can call it a “policy” (Jeff Sessions) or you can call it a not-policy (Kirstjen Nielsen) or you can call it a “law” (Sarah Huckabee Sanders). You can say that yes it’s a policy but nobody likes it (Kellyanne Conway) or you can say it’s a “zero-tolerance” enforcement of a Democratic law (Donald Trump) or a zero-tolerance enforcement of an amalgam of various congressional laws (Nielsen) or a zero-tolerance enforcement of the Department of Justice’s own preferences with respect to enforcing prior laws (Sessions).