I don’t think he’ll be given a choice, TBH. Written responses are generally only allowed in cases where the testimony of the person is of lower value than their time (e.g. a trauma surgeon being sued over 2 inches of fence line placement would usually be allowed to give written responses, or a celebrity on tour and being questioned over some relatively minor civil suit).
For something where the security of the free world is at stake… Yeah, that doesn’t quite meet that bar.
