Reply #3: At this point, I'm not sure Congress has much say in the matter.

[man4allcats]

As per the article's last paragraph:

"Nora Dannehy, a federal prosecutor in Connecticut, is leading the separate investigation for the Justice Department. She could bring criminal charges against the officials responsible for the firings if she finds that they were done to obstruct justice or for other illegal reasons. Ms. Dannehy, who has the power not only to subpoena but to indict, is in the best position to learn all of the facts and ensure that justice is done."

- Emphasis mine - m4ac