This might explain how all the information about Frankie suddenly becomes available. There's a fear of leaking information and being the only source, but once some part of it is leaked people tend to loosen up quite a bit.

It's a small gesture, but Questadt shoots a quick look at the Senator as he reveals the additional witness, and at the very end of the shot Questadt has his head resting on his hands, looking (to me) pensive. To me, it seems he thinks the Senator just screwed up.