Home Office staff have been urging colleagues to "organise and resist" against plans to send asylum seekers on a one-way trip to Rwanda.
Civil servants looked to senior staff for advice on how they could "cope" with their conscience, as the Government signed the deal with the East African nation.
Priti Patel earlier this week hit back at critics of the Government's plan to send asylum seekers to Rwanda, claiming they had failed to offer any alternative solution to the crisis.
The plans have been widely blasted as inhumane, illegal and unworkable, with the Archbishop of Canterbury claiming the scheme "does not stand the judgement of God" in his Easter Sunday sermon.
In the online private forum, one Home Office employee claimed they did not "feel safe" telling people they worked for the department, in the wake of the proposals.
The comments seen by Mail+, one member of staff said: "Can we be collectively courageous and just say no as a department (to the Rwanda 'partnership'), it's a car-crash waiting to happen."
A Home Office spokesperson said: “The Home Office is committed to constructive and open conversations with staff on our policies.
"However, personal attacks are unacceptable and we will remove comments from our channels that are disrespectful, break our guidelines or contravene the Civil Service values of integrity, honesty, objectivity and impartiality.”
In the Commons yesterday, senior Tory MPs questioned the logic behind the Rwanda plan as Lords amendments to the Nationality and Borders Bill were brought to the chamber.
The Bill would allow the UK to send asylum seekers to a “safe third country” and to submit claims at a “designated place” determined by the Home Secretary.
But MPs and campaigners have criticised the plans to forcibly send to Rwanda thousands of asylum seekers who arrive in the UK in unauthorised Channel crossings.
Tory MP Simon Hoare said: “A safe route clearly would kill the evil traffic of people smuggling at a stroke, that’s one way of dealing with it.
“I fail to see how moving people to Rwanda is going to in any way disrupt this money-making scheme which these people traffickers have. They’re just going to use different routes to land people on our shores. I’m just not getting it, I’m afraid.”
Former Tory minister Sir Bob Neill suggested investing the money intended for the Rwanda immigration deal into improving the UK’s system for handling claims.
The Lords had also sought to remove a broad provision to make it a criminal offence to knowingly arrive in the UK without permission, and ensure any move to offshore asylum claims was subject to approval of both Houses of Parliament – along with a cost breakdown.
