Rep. William Timmons, R-S.C., told Fox News Digital it was "frustrating" to see Hillary Clinton "obstinate and sort of annoyed at the process."

"She had an excuse for everything. But when you've got a pattern of involvement and a pattern of association, the American people deserve answers," Timmons said.

"Honestly, I tend to find her to be fairly credible, but I mean, all of this is going to culminate tomorrow with President Clinton, and he has a lot of really hard questions to answer. And I don't think that the American people are going to like his answers."