Seventeen states have decided to pursue a lawsuit against the Obama administration over President Obama’s issuance of an executive order that would ease the threat of deportation for millions of illegal immigrants. The lawsuit was filed on Wednesday and named the top immigration enforcement agencies as defendants.

As Republicans try to figure out the best response to President Obama’s November 20 announcement that he would use executive action to grant protection from deportation to millions of illegal immigrants, editorial writers have called the presidents’ plan unprecedented and even unconstitutional.

When asked on December 1 by ABC News reporter Jonathan Karl if President Obama would veto a funding bill that did not provide funds for him to carry out his executive action to grant amnesty from deportation to millions of illegal immigrants, White House Press Secretary Josh Earnest replied, simply: “Yes.”

A researcher from the influential Heritage Foundation estimates that the cost to U.S. taxpayers of President Obama’s pending grant of amnesty to millions of illegal immigrants will be “around $2 trillion.”

Since President Obama delivered his plan on TV on November 20 to use executive actions to grant protection from deportation to millions of illegal immigrants, Republicans in Congress have considered the best way to respond legislatively. Among the options that GOP legislators have proposed are removing funding from U.S. Citizenship and Immigration Services, a Senate filibuster of immigration-related funding bills, and a government shutdown.