There is a story of a woman originally from Singapore who lives here and has been married to a Brit for 27 years, they have 2 kids and a grandchild.
Her parents had been ill and she has spent the last few years going home to take care of them. They have now passed away. She had indefinite leave to remain which has been revoked and was apparently taken on a Sunday by authorities and sent to a detention centre before being put on a flight with £12 and the clothes on her back. Her husband is poorly after a heart bypass, I think it was.
You are not allowed to leave the country for a certain amount of time on the visa she has, but she probably needed to take care of ailing parents. Also Singapore does not Allow dual citizenship which maybe why she did not apply for UK passport as that probably would have been tricky for her parent emergencies etc.
We are no better than Trump.
Sorry cannot paste it right now, but it's on Google.