A new medical care insurance bill is passed by Congress, and the president signs it into law. A group of citizens challenges the law as unconstitutional. Which of the following developments would demonstrate a governmental check to this action?
1) The U.S. Supreme Court hears the case and rules in favor of the citizens, striking down the law.
2) The press organizes a massive campaign, broadcasting the views of those who disagree with it.
3) Congress holds hearings in which it calls witnesses who have been negatively affected by the law.
4) Congress threatens to impeach judges who side with citizens in declaring the law unconstitutional.