There have been no ground rules or topics defined, according to one of the sources. The meeting will be behind closed doors.
Two sources familiar with Cipollone’s testimony told CNN that he was asked extensively about his role in that meeting where Trump welcomed the group of extreme election deniers to the West Wing and what was discussed. One source familiar with Cipollone’s testimony told CNN that he described to the committee his view of how insane the meeting was.
The session, which, according to two people familiar with the matter, began as an impromptu gathering, devolved and eventually broke out into screaming matches at certain points as some of Trump’s aides pushed back on Powell and Flynn’s more outrageous suggestions about overturning the election.
Select committee aides told CNN that Flynn will be among the former Trump associates whose role in overturning the election will be highlighted during Tuesday’s hearing.
The December 18 meeting, committee aides said, is of high interest to the panel’s investigation. They pointed to a tweet Trump sent the following day, encouraging his supporters to descend on Washington as a key moment that ultimately led to the violence on Capitol Hill on January 6.
This story has been updated with additional details Monday.
CNN’s Pamela Brown, Ryan Nobles and Katelyn Polantz contributed to this report.