At least nine former Trump cabinet secretaries have now spoken to the Jan 6 committee
Ms Chao resigned immediately after the attack on the US Capitol and discussed removing Donald Trump under the 25th Amendment, according to testimony provided to the House select committee.
Former Secretary of State Mike Pompeo also spoke with the committee on Tuesday, according to the Associated Press, while Mr Trump’s Treasury Secretary Steve Mnuchin testified in July.
On Sunday, committee vice-chair Liz Cheney said the panel were preparing to interview more former cabinet secretaries as part of its investigation into the US Capitol riot and Mr Trump’s multi-pronged efforts to overturn his election loss to Joe Biden.
Ms Cheney added that they were prepared to subpoena Ginni Thomas, the wife of Supreme Court justice Clarence Thomas, to discuss her role in the siege on the Capitol.
At least nine former Trump cabinet members who were in their roles on January 6 have now testified before the committee.
After holding eight blockbuster public hearings over the summer, the January 6 committee has said it will resume sitting in September.
The committee is also focusing on a last-ditch scheme to send fake electors from battleground states to stop Mr Biden’s victory when Congress met for the typical routine job of certifying the state election results.