The committee's ninth public hearing will touch on the "close ties between people in Trump world and some of these extremist groups," Rep. Zoe Lofgren, D-Calif., said in a CNN interview.
"There's some new material that, you know, I found as we got into it, pretty surprising."
Later that same week, the committee interviewed Virginia Thomas, the wife of Supreme Court Justice Clarence Thomas, for about 3.5 hours.
Thomas was not videotaped during her interview with the committee, Lofgren said over the weekend in an MSNBC interview.
The committee also faces an end-of-the-year deadline to submit a final report to the president and Congress containing its findings.