Rep. James Comer (R-KY), House Oversight and Government Reform Committee chairman, hinted on Thursday that the committee may pursue a testimony from former Vice President Kamala Harris in its autopen investigation.

House Republicans have aimed their investigative power at the Biden administration, looking to figure out the extent, if any, to which former President Joe Biden’s physical and mental decline was covered up by his staff, and whether others acted in his stead through the use of an autopen. Comer hinted that Biden’s No. 2 could be next on the list to testify before the committee.