First Minister Arlene Foster described the past few days as a "tough old week" following the revelations surrounding the bungled Renewable Heating Incentive.
Mrs Foster was in Belfast to open the constituency office of Christopher Stalford MLA.
It follows after the DUP leader was accused by one of her own MLAs, Jonathan Bell, of being abusive and of ordering a delay in the closure of the flawed green energy scheme. Claims she strenuously denies.
Many of the parties most senior members were in the Sandy Row office for the official opening on Friday.
Mrs Foster said it had been a "tough old week".