You have allowed a liar to be elected.Consider a universal test for qualification to hold any elected office (or executive office for that matter).

https://medium.com/liecatcher/the-elected-official-liar-test-4d4f0242b89b?source=friends_link&sk=87d9755b58b3145f23738909277acdc6

This is seriously feasible but not without a deep understanding of why it is the right answer.