Michelle O'Neill has said she was not fully briefed on the detail of risks and potential responses to a pandemic when she was health minister.
The Sinn Fein vice president served in Stormont's health portfolio from May 2016 to the then collapse of the Assembly in 2017 following the resignation of then deputy first minister Martin McGuinness.
She was called to give evidence to the UK Covid-19 Inquiry, which is in an early stage examining the country's preparedness for a pandemic. During the pandemic, Ms O'Neill had been deputy first minister.