The head of the UN refugee agency has condemned plans by Britain to send the first flight of asylum seekers to Rwanda on Tuesday.
Filippo Grandi says the policy set a catastrophic precedent.
He says other countries that took in far more asylum seekers than Britain could decide to follow its example.
Courts in London have rejected two last-minute challenges to the new policy.
The British government argues that the move is designed to deter people trafficking, but there's been widespread criticism by opposition parties and rights groups.