On Tuesday, he was offered strong support by Oxfam's chair of trustees Caroline Thomson.
Evans said 120 Oxfam staff working in three different countries were confidentially surveyed regarding issues around sexual harrasment and exploitation.
Oxfam's former global head of safeguarding - has now told media that she begged senior staff and the charities watchdog to act about sexual abuse allegations she had uncovered.
We are committed to continually learning and improving in order to protect our staff, volunteers and beneficiaries from sexual harassment and abuse and create a safe place to work for all.
Ms Evans claimed she was told about two women being coerced to have sex and a worker who had failed to say he had previously been struck off for sex abuse.
"Following concerns raised in this article, the staff member has been put on leave while we examine the issues raised and follow our Code of Behavior protocol to determine next steps", Bain said.
She said a meeting was held to discuss her concerns about widespread abuse but no action was taken until a year ago.
"Like us, she is appalled at what happened and is determined to do what is best for Oxfam and the people we exist to help", he said. "I'm not the kind of person who would have ignored anything like that - why would anyone?"
The former Richmond MP also knows that the continuing lurid claims about the sexual exploitation of the most vulnerable, the victims that the charities were supposedly helping, will make it harder to justify the £13bn a year that Britain now spends in this field when domestic policy priorities are denied funds.
Haiti, which suffered a devastating natural disaster in 2010, has sent a warning to worldwide aid agencies following the claims against Oxfam.
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In a tweet in French, Haiti's President Jovenel Moise called charity's actions in Haiti an "extremely serious violation of human dignity".
Miss Mordaunt has sent a letter all United Kingdom charities working overseas - including Oxfam - to demand they do more "to fully protect vulnerable people".
The director of investigations at Britain's Charity Commission, which regulates the voluntary sector, accused Oxfam of not giving them the full story during the investigation.
Britain's regulator the sector, the Charity Commission, is meeting with Oxfam officials February 14 to discuss the alleged concealment of a report of sex, parties, and using sex workers in Haiti.
Mourdaunt warned Monday that Oxfam could lose more than $44 million in annual funding from her government unless it was forthcoming with full details of the scandal.
She told Crux in an email exchange that all staff are required to sign safeguarding policies and are also made aware of their mandatory duty to report any incident or allegation of exploitation or abuse, and that Trócaire does regular auditing, training and monitoring.
"There was a woman being coerced to have sex in a humanitarian response by another aid worker", she said.
Shadow global development secretary Kate Osamor said both the watchdog and the Government have questions to answer over Ms Evans's claims they ignored her calls to act.
A sex-abuse scandal at Oxfam, the British-based global charity, is roiling United Kingdom politics, and the repercussions may ripple around the world.