Even if he did say it in social media.... It's just another lie, until his lawyers presents that REQUEST to the committee in writing.
You know his lawyers arehaving a heart attack, from this comment from him. (If he did say it). No way would they advise him to testify under oath, under any condition....
and he kinda just screwed himself, big time, by the offer to do it publically. It's an admittance that his testimony is not executive privilege, or an admittance that there is no 5th amendment reason for him not to testify in private, as all others interviewed. If it is ok with him to talk publically, then it is ok, to do it privately....