Will justice dept officials be subpoenaed?

Interesting stuff here. So a Senate Committee is going to request 5 officials testify voluntarily. They're also going to vote on whether to subpoena the people if they refuse. Isn't that odd? Why not wait until they actually refuse? There's a few ways this could play out.

1. The people want to talk and do it voluntarily.
2. The people don't want to talk, but would rather do it voluntarily (possibly not under oath) than by subpoena.
3. As with the US district attorneys, these Republican footsoldiers at least pretend to not want to talk, but will grudgingly spill the beans if subpoenaed.

I think we can mostly rule out case #1. These guys have some serious skeletons in the closet, and their only motivation to talk will be to keep from being somebody bigger's fall-guy. I can also predict they will decline the invite if the vote fails. So in that respect the voluntary bit is not only a courtesy, but a one-sided courtesy.

As for the vote, my initial guess was party line. But that gets a little tricky...if it's going through anyway, the Republicans might sign on to not look bad. One thing you can be sure of...these subpoenas would never have happened if Republicans still ran Congress.