Terming her action as anti-party activities, the party's disciplinary committee has suspended Kaur and asked her to explain within three days why she should not be expelled from the party.
Singh will be joining the BJP nearly a year after quitting the Congress following a political crisis that pushed him to step down from the post of Chief Minister ahead of the Punjab assembly polls.
As he is going to keep a big political step ahead with his new party, the announcement has drawn major attention and stirred debates over how his party would perform in the Punjab assembly polls.
Amarinder Singh is the 15th Chief Minister of Punjab, having served two terms - from 26th February 2002 to 1st March 2007 and from 16th March 2017 to 18th September 2021.