The EU should "do its best to undermine" the "homogeneity" of its member states, the UN's special representative for migration has said.
Peter Sutherland told peers the future prosperity of many EU states depended on them becoming multicultural.
He also suggested the UK government's immigration policy had no basis in international law.
He was being quizzed by the Lords EU home affairs sub-committee which is investigating global migration.
Mr Sutherland, who is non-executive chairman of Goldman Sachs International and a former chairman of oil giant BP, heads the Global Forum on Migration and Development, which brings together representatives of 160 nations to share policy ideas.
...He told the committee: "The United States, or Australia and New Zealand, are migrant societies and therefore they accommodate more readily those from other backgrounds than we do ourselves, who still nurse a sense of our homogeneity and difference from others.
"And that's precisely what the European Union, in my view, should be doing its best to undermine."
...Mr Sutherland, who has attended meetings of The Bilderberg Group, a top level international networking organisation often criticised for its alleged secrecy, called on EU states to stop targeting "highly skilled" migrants, arguing that "at the most basic level individuals should have a freedom of choice" about whether to come and study or work in another country.
Mr Sutherland also briefed the peers on plans for the Global Migration and Development Forum's next annual conference in Mauritius in November, adding: "The UK has been very constructively engaged in this whole process from the beginning and very supportive of me personally."
Asked afterwards how much the UK had contributed to the forum's running costs in the six years it had been in existence, he said it was a relatively small sum in the region of "tens of thousands".
Source: BBC H/T Alexander Aslanian, Cheradenine Zakalwe