WATCH: GOP Candidates Can't Answer 'Just One Question': Would You Have Invaded Iraq?

With the 2016 presidential race heating up, candidates must be prepared to address tough questions about everything from the economy to health care to foreign policy -- but there's one burning question that's likely to dominate GOP political circles. In the parody video above, "The HuffPost Show" pits Republican frontrunners against one another in a tense trivia match during which they must answer the ultimate question of the election season: Would you have invaded Iraq?

Watch more from "The HuffPost Show" here.