The United Nations has insisted its special rapporteur did not break any rules on her controversial visit to Britain to study the coalition's so-called 'bedroom tax'.
Conservative Party chairman Grant Shapps had written to UN secretary general Ban Ki-moon criticising Raquel Rolnik's interventions on the policy.
Jane Connors, an aide to the UN High Commissioner for Human Rights said Mr Ban had asked her to respond.
"Country visits are governed by rules and procedures set out in the code of conduct referred to above and the manual of operations adopted by special procedures," she said.
"Ms Rolnik's visit was planned and organised over many months in consultation with the Government in compliance with these rules and procedures."