The Bishop has on several occasions and even in his most recent book Letter to a Suffering Church advocated for a lay-lead (i.e. no priests or bishops) forensic investigation into the most recent scandal involving high ranking clerics such as Theodore McCarrick. He has been specific in that the investigation should be handled by forensic professionals with no oversight or control from Church authority. The objective would be to find out who knew what and when, and whether there was malfeasance.

The US conference of Catholic Bishops petitioned the Vatican to allow this to happen in 2018, and there has been no clear response. Neither a yes or a no. They promised in February of this year there would be measures taken, but this specific investigation was not on the table.

Something to understand is that in Catholic Hierarchy of Authority, Bishops are all equal— so the US Conference of Catholic Bishops doesn't have the authority to investigate or sanction any Bishop. There might be a president of the USCCB, but he doesn't in practice have authority over any other Bishop. The only one who has authority over all other bishops is the Pope. In the case, the Pope has chosen not to publicly address this request.