Pottinger is slated to appear alongside former Trump White House aide Sarah Matthews.
CNN previously reported that Matthews, who resigned from her post on January 6, was expected to testify publicly.
Committee members have said Thursday’s hearing will examine Trump’s inaction for 187 minutes while the US Capitol riot was unfolding.
A spokesperson for the committee declined to comment. A spokesperson for Pottinger did not respond to CNN’s request for comment.
This headline and story have been updated with additional reporting.
