[1/2] Migrants leave a French maritime protection vessel, as the boat they were travelling in with 60 other migrants began to take water in the English Channel, in an attempt to reach Britain, in Boulogne-sur-Mer, France, November 29, 2022.
The new legislation will mean that anyone who arrives on small boats will be prevented from claiming asylum and deported to so-called safe third countries, according to government officials, who asked not to be named.
The court subsequently ruled it lawful in December, but opponents are seeking to appeal that verdict.
It is expected the legal battle will end up in the UK Supreme Court and may not be resolved for months.
Once the small-boat crossings have ended, Britain would be prepared to create more legal routes for asylum seekers, Sunak said last year.