Marc Short, the former chief of staff to Vice President Mike Pence, is cooperating with the January 6 committee, a significant development that will give investigators insight from one of the highest-ranking rump officials, according to three sources with knowledge of the committee's activities.

Ir is being reported for the first time that the committee subpoenaed Short a few weeks ago

A number of figures close to Pence, including Short, may be willing, either voluntarily or under the guise of a "friendly subpoena," to cooperate with the committee.