 So I think the question is what kind of issue. I assume it means a president who is perceived by some to be impaired and what can be done about it legally, not medically. And the best answer to that is now, unlike in the old days, having a 25th Amendment where there's a process for removing a president, people think he's unfit. And that would be his cabinet officers and the vice president and then confirmed by the Congress. There is no non-political mechanism for doing this. Numerous efforts have been made to set up