What's going on with the investigation into January 6th?

[StarfishSaver]

9. Great question

It's possible they will want to litigate and get a ruling on certain issues - for example, whether some communications are covered by executive privilege - sooner than later. However, such a ruling would not necessarily apply to all of the witnesses since the validity of an executive privilege claim is very fact dependent (unless, for example, the court were to rule that no conversation Trump had in relation to the post-election was covered, which would be a stretch).

So, yes, they may want to move forward with subpoenas soon in order to have time to deal with any pushback - it looks like they will be issuing some in the coming weeks.

But witness testimony has to be handled very strategically. These investigations are like big jigsaw puzzles and witnesses are called when they are needed, not just to test the waters. Contrary to what some people think, public witness testimony is a very small part of the overall investigation and they are usually brought in either very early to help frame issues for the public - as was done when the Committee heard testimony from the law enforcement officers involved in defending the Capitol on January 6 - or brought in much later after a substantial amount of information has been gathered through the committee's investigation. Much of the evidence they need is obtained from friendly witnesses who provide information and documents without being called to sit in front of the committee on television.