Reagan and Bush acted unilaterally on immigration, too—for the same reason that Obama will

In contrast, they argue, Obama’s executive action is not what Congress intended. “A new order would not further a congressional purpose,” Frum writes. “It is intended to overpower and overmaster a recalcitrant Congress.” Krikorian was even more emphatic: “Whatever their merits, the Reagan and Bush measures were modest attempts at faithfully executing legislation duly enacted by Congress. Obama’s planned amnesty decree is Caesarism, pure and simple.”

What both Frum and Krikorian’s analyses fail to explain is how Obama’s planned action is not a faithful attempt at executing the law. You can’t argue that Obama’s “order would not further a congressional purpose” without explaining what Congress’s purposes are in passing immigration laws. This error isn’t unique to Frum or Krikorian: Conservatives often fail to use a legal framework in analyzing Obama’s action.

In August, I employed such a framework to explain why Obama’s executive action is legal because it’s based on the idea of prosecutorial discretion—the federal government has only limited resources to implement laws and must prioritize them accordingly. But prosecutorial discretion has limits because Congress has the sole authority to write laws. If the president’s actions do not uphold Congress’s priorities—or, in Frum’s words, further a congressional purpose—it crosses the line into lawmaking.