 Official acts could mean things like appointing ambassadors and dealing with foreign governments. The justices also sent the case back down to lower courts to determine what exactly constitutes an unofficial act. We'll be taking your calls on this decision later this evening at 8 p.m. Eastern time here on C-SPAN Radio. You can also participate on C-SPAN, C-SPAN Now, our free mobile video app, or online at c-span.org.