Is it required to hold office? How far back should we look when evaluating their taxes? What happens if they did make a mistake 30 years ago? Have you ever made a mistake with your taxes?
I'll never run for office because I hate politics, but even if I haven't knowingly broke any tax laws, I wouldn't want to release my taxes either. If we're going to make a law that says you need to release your tax data, then it should also include medical records and all other sort of stuff, IMO.
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Hiding?

He's been in public office for 40 fucking years.