Dan Pfeiffer: “The real legal questions about the compact have never been tested because it has never been in effect. The Constitution’s Compact Clause requires Congress to approve agreements between states. That’s certainly not happening as long as Trump has a veto pen.”“Supporters believe they don’t need congressional approval because the Constitution gives states the power to appoint their electors, and the Supreme Court has ruled that states get to decide how they appoint them.”“Needless to say, if the compact goes into effect, there will be a giant legal fight. And if it does go into effect, it will make a confusing system even more confusing, even if the end result is the very simple proposition that the person who gets the most votes wins. The fact that blue states will be forcing red states to do this will certainly be pretty contentious.”