Minnie Driver is stepping down from her role as a celebrity ambassador for Oxfam after learning of their involvement in a sex scandal.

Driver’s departure comes after claims surrounding some of Oxfam’s staff, who reportedly paid for sex while on a mission trip to Haiti in 2011.

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The “Good Will Hunting” actress told BBC News she is “nothing short of horrified” by the allegations.

Driver, who has supported the British charity for more than 20 years said, “I certainly will not let the abhorrent mistakes of a troubling organization stop me or anyone else from working with good people in this space to support a population of human beings around the world that needs our help.”

Oxfam denies the allegations, including the claims they covered up the illegal act in 2011.

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Driver is the first celebrity ambassador to comment. Other ambassadors include Anne Hathaway, Beyonce, Elton John and more.

Deputy chief executive, Penny Lawrence, has resigned over the organization’s handling of complaints.