I really have no problem with a reporter "ambushing" an interviewee with an unexpected question or two. The trouble with FOX is that they like to ask and answer the questions themselves.
Good for Clinton to stand up and not take any of that BS. He had a number of options:
- not answer and have FOX do it for him
- storm off the set like Bill O'Reilly did with Terry Gross (guess he couldn't take a dose of his own medicine)

- or, do what he did - Make Wallace allow him to answer the questions himself.

I can't help but imagine GW Bush in the same position . . . HA!
Of course, he'd never be in that position. Six years after his presidency, I imagine he'll be well-faded into the woodwork. 'Course, we'll still be cleaning up his messes. . . .
But, I imagine W won't be out there trying to make the world a better place like Carter and Clinton have done and are continuing to do. ( I imagine Reagan would have continued his efforts as well, if his health had allowed it)