mattal rod, although the department of justice has this guidance about not indicting a sitting president, they're not bound in the state by those same guidelines. so although the supreme court may ultimately decide the constitutional question, there's nothing that would prevent them from charging the president with a crime in the state system. >> adam, we non-lawyers have become interested in the intricacies in the legal system and that conversation i had earlier with mattal rod about indicting a sitting president. a lot of people don't want to have the conversation about impeachment. 40 percent of americans might be interested, more than half are not, democrats don't want to talk about it and no republicans do but you wrote a remarkable article about what the framers of the constitutions thought about reasons for impeachment. tell us about this. >> i might have thought that you draw a bright line that the president should be impeached for things he does in office, for abusing the power of his office for corrupting his office