His words echoed those by a spokesman for British Prime Minister Theresa May, who this week condemned the "horrific behaviour" within Oxfam as her government opened an official inquiry into the charity and a top executive resigned in shame.
The boss at the centre of the Oxfam scandal resigned from a previous position in the charity sector after allegations he attended sex parties with young and vulnerable women in Liberia.
"As programme director at the time, I am ashamed that this happened on my watch and I take full responsibility".
"All I can tell you about this terrible revelation about Oxfam is that I am devastated", Driver tweeted.
In the latest revelations, the Sunday Times reports more than 120 workers for Britain's leading charities were accused of sexual abuse in the past year, "fuelling fears paedophiles are targeting overseas aid organisations".
Ms Mordaunt said her criticism was not directed exclusively at aid workers accused of exploiting people in Haiti but at "the way the organisation responded".
The actress, who actually has Irish connections with family based in Mullingar, said she was "nothing short of horrified" by the sex scandal to rock the charity.
Several of Oxfam's corporate sponsors, including Sainsbury's, Visa, M&S and the Co-op bank, have said they contacted the charity to raise concerns about the claims.
Oxfam Canada executive director Julie Delahanty said she assured the government that no staff or funds from her organization were involved in the Haiti allegations.
Alasdair Allan has told NGOs that the Scottish Government expects the "highest moral and ethical standards" from organisations meant to offer help to communities "at their time of greatest need".
Oxfam now faces a battle to prevent other high-profile ambassadors from stepping down as well as making sure the United Kingdom government does not withdraw the £32 million (Dh163m) of funds it receives.
"However, the Scottish Government will not hesitate to take appropriate action whenever we suspect that any abuse has occurred, and we expect the same commitment from those working with us".
She said the crackdown should be a wake-up call to the aid sector.
In a statement, Oxfam denied providing positive references for those implicated, and said they were likely provided on an individual capacity.
M&S, which has worked with Oxfam since 2008, said in a statement: "M&S continues to monitor the situation very closely as we seek to understand the steps that Oxfam is taking to address them and develop a robust safeguarding plan for the future". It's unclear what role the former Oxfam employee was given at the Catholic charity.