Note that the Barrister pushing this has a rather clear motive for preventing the British from controlling their borders.
She doesn’t want the invasion force stopped. She’s one of them.
The uniparty is not just an American menace.
People who are non-EU citizens cannot go to the UK without a Schengen and cannot work there without a valid work permit
People from Guyana, Pakistan, Jamaica, the US, New Zealand etc. need work permits to work in the UK, Brexit had nothing to do with theis