The Home Office has “no idea” what its £400m-a-year immigration enforcement unit achieves, meaning it is unprepared for Brexit, MPs have warned.
The cross-party Public Accounts Committee said a lack of diversity at the top of the department also risked a repeat of the Windrush scandal.
Its policies may be based purely on “assumption and prejudice”, it warned.
A Home Office source said the home secretary has committed to implementing the findings of a review into Windrush.
The Home Office’s 5,000-strong Immigration Enforcement directorate, and other parts of the system, have been repeatedly reorganised since being branded “unfit for purpose” 15 years ago by the then home secretary.
The latest massive changes will come in January to deal with the end of freedom of movement.