I think the the four days to appear is an option, not a requirement, to come in to present his 'case'.
That course of action is obviously fraught with more hazards than his golf courses and his lawyers have no doubt
advised him so.
Not that it matters, but its a courtesy that, if not proffered by Smith, would leave him open to justified criticism.
'Hey, don't all 'targets' get the chance to come in and talk?'
Trump: Not that I would go in but it's very unfair, I'm being treated very unfairly, even for a witch hunt by a deranged guy. No target has ever been treated so unfairly.