my open on the lawyer's side for these witnesses is that they avoid having to testify in public for legal reasons and that they limit their testimony under oath to mueller. >> so in addition to the testimony or interview next week as early as wednesday, the committee has also all documents, e-mails, texts, notes, voice mails be preserved from that june 2016 meeting. why wouldn't that request have already been made, particularly when it was made public when don jr., you know, released his e-mails preemptive of the reporting of those e-mails in the newspaper just to make sure that nothing would be destroyed or altered before testimony? >> yeah. well, it's a good question as to timing. you'd think that that would have been done already as soon as the meeting was revealed. i'm not sure that it actually wasn't done previously by white house counsel issuing an internal memorandum to staff