Priti Patel faces the first legal challenges against her plan to deport asylum seekers to Rwanda.
Charity Freedom from Torture has warned the Home Office it could pursue a judicial review and demanded documents and risk assessments.
Meanwhile, the Open Rights Group is gearing up a challenge over sensitive personal information that will be transferred to the Rwandan government.
And Freedom from Torture launched a crowdfunding drive to pay for a legal challenge it hopes will see the policy pulled.
“The plan is immoral and likely unlawful,” said charity boss Sonya Sceats.