Oooo.K. - she probably said they would corroborate her statement. Nobody bothered to find out if they would in the rush to have the surprise hearing.Not a lawyer here, but one of the guidelines for those questioning witnesses in any kind of formal hearing is: don't ask a question that you don't already know the answer to.
If the committee members were confident enough to ask Hutchinson the questions they asked yesterday, they were obviously confident that what she was saying was true, and could be verified. That's enough for me.