"It is an unworkable, unethical, and extortionate policy that would cost the UK taxpayer billions of pounds during a cost of living crisis and would make it harder not easier to get fast and fair asylum decisions", Cooper said referring to the Rwanda scheme.
The UK-based charity Refugee Council, in turn, called for an immediate rethink of the plan as the organisation's CEO Enver Solomon told The Daily Mirror that the charity was "appalled by the government's cruel and nasty decision".
"UNHCR does not support the externalisation of asylum states' obligations. This includes measures taken by states to transfer asylum seekers and refugees to other countries, with insufficient safeguards to protect their rights, or where this leads to the shifting rather than the sharing of responsibilities to protect refugees", the agency's spokesperson said in a statement.
"Our compassion may be infinite, but our capacity to help people is not", the PM will add, noting that 600 migrants crossed the Channel on Wednesday, a record daily number for this year.