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“What is your tax rate?” George Stephanopoulos asked Donald Trump on ABC’s “Good Morning America.”

“It’s none of your business,” Trump replied.

That answer is absolutely and completely unacceptable. When you choose to run for president, and have a real chance of actually winning, everything becomes the public’s business.

This principle goes far beyond Trump’s taxes. If voters are going to make a reasonable judgment about how he might act in the future, they have a right to know how he’s acted in the past. Everything means everything. Transparency and accountability are not optional.

This principle applies to all candidates, including Hillary Clinton, but it is particularly important in Trump’s case because he has never held public office. He has never been through an election, or even a congressional hearing — experiences that test and expose a person’s background and ability to perform under pressure.

He has never served in a legislature, so he has never had to cast a single vote that forced him to go beyond speechifying and crystalize how he truly feels about an issue. He has never been an executive — meaning a mayor or a governor — where he had to make decisions that reveal his core values and priorities.