The UK’s House of Lords has voted to delay ratification of a treaty with Rwanda, dealing a blow to Prime Minister Rishi Sunak’s plan to deport migrants to the East African country. The treaty is central to the government’s policy of combating illegal immigration. Sunak, who survived a parliamentary vote on the issue last week, is under pressure to deliver on the plan. Critics argue that the plan is an expensive gimmick that will not work and that the government should focus on clearing asylum backlogs. The bill defining Rwanda as a safe third country will be debated in the House of Lords next week.