There isn't any provision to expel a member state, but TEU Post seven delivers with the suspension of specified legal rights. Released in the Treaty of Amsterdam, Post 7 outlines that if a member persistently breaches the EU's founding concepts (liberty, democracy, human legal rights and so on, outlined in https://rtp-member4d17260.qodsblog.com/29598748/the-smart-trick-of-member-4d-that-no-one-is-discussing