LONDON -- A British judge on Friday rejected a bid to ground a flight due to take more than 30 asylum-seekers on a one-way trip to Rwanda next week, but gave the migrants permission for a last-minute appeal.

The flight leaving Tuesday is the first under a controversial deal between the U.K. and the East African country. Britain plans to send some migrants who arrive in the U.K. as stowaways or in small boats to Rwanda, where their asylum claims will be processed. If successful, they will stay in the African country. Human rights groups have called the idea unworkable and inhumane.

Judge Jonathan Swift on Friday refused a request from a group of the asylum-seekers, backed by a trade union and refugee groups, for an injunction grounding the flight. But he said an appeal could be heard on Monday, and more legal challenges to the British government's new Rwanda deportation policy are due in the coming days.

Britain's immigration minister, Home Secretary Priti Patel, welcomed the ruling and said the government would 鈥渘ot be deterred鈥� by further legal challenges.

Enver Solomon, chief executive of the Refugee Council, said he was disappointed and called the situation 鈥渆xtremely worrying.鈥�

At the High Court in London, government lawyer Mathew Gullick said 37 people had been due to be aboard Tuesday's flight, but six have had their deportation orders canceled. He said the government still intended to operate the flight, as well as future ones.

The British government has not provided details of those selected but refugee groups say the group includes people fleeing Syria and Afghanistan who arrived in Britain across the English Channel. The U.K. has paid Rwanda 120 million pounds (US$158 million) upfront for the plan.

The claimants' lawyer, Raza Husain, said 鈥渢he system is not safe鈥� and UN officials say the U.K. plan violates the international Refugee Convention.

Laura Dubinsky, a lawyer representing the UN refugee agency, said refugees sent to Rwanda under the program were at risk of 鈥渟erious, irreparable harm.鈥� She said the agency had 鈥渟erious concerns about Rwandan capacity鈥� to handle the arrivals.

Rwanda is the most densely populated country in Africa and already home to tens of thousands of refugees. Competition for land and resources contributed to decades of ethnic and political tensions that culminated in Rwanda's 1994 genocide in which more than 800,000 ethnic Tutsi and the moderate Hutu who tried to protect them were killed.

President Paul Kagame's government has achieved significant economic progress since the genocide, but critics say it has come at the cost of political repression. Obedience to authorities is widely enforced, one reason Rwandan cities and towns are clean and among the most orderly in Africa. There is little political opposition.

Patel said 鈥淩wanda is a safe country and has previously been recognized for providing a safe haven for refugees.鈥�

鈥淲e will continue preparations for the first flight to Rwanda, alongside the range of other measures intended to reduce small boat crossings,鈥� she said.

The government says it welcomes refugees who come to Britain by approved immigration routes but wants to put the criminal smuggling gangs who operate dangerous Channel crossings out of business.

More than 28,000 migrants entered the U.K. across the Channel last year, up from 8,500 in 2020. Dozens have died, including 27 people in November when a single boat capsized.