[Melas]

It's not that congress can't, it's that congress won't. The real problem is the subpeonas were bogus, and congress knows it. To pursue anything further means a detailed examination of just how bogus the subpeonas really are.

Let's be honest. Congress wasn't really calling for testimony. Congress was issueing subpeonas with the sole intent that the feeding tube be reinserted. The subpeonas were a pretext for the real agenda, the reinsertion of the feeding tube.

[CyberAnt]

"the subpeonas were bogus"

No they were not - they were withdrawn. I don't know legally why - but just because they were withdrawn doesn't mean they had no original intent.