People with high approach motivation tend to be really curious, and would always go out of their way to fill up their schedule. They are much more likely to stay committed in pursuing their interest, but they often possess narrow attention and might ignore everything that does not attract their interest
In order to challenge a new law as a citizen you need to use the court system. The citizen in question would need to file a class action lawsuit in court seeking to declare the federal law unconstitutional. This is then reviewed and decided by the courts, where the Supreme Court ultimately has the final verdict on this issue.