Theresa May faces defeat in the House of Lords over the rights of EU nationals post-Brexit.
Amendments to guarantee residency rights for residents from the European Union already present in the UK were rejected in the voting stages of the bill in the House of Commons.
Now, peers in the House of Lords want a clause to guarantee those rights for EU nationals, and will vote over the issue today.
However, a source in the Labour Party told the Independent this would most likely result in a defeat for the Government - which could eventually force them to grant confirmation of residency for Britain's existing EU residents by law.
The Government's position has always been to secure the status of EU nationals after the triggering of Article 50 and once secession negotiations with the European Union begin.