There isn't any provision to expel a member state, but TEU Posting 7 gives for your suspension of specific legal rights. Launched within the Treaty of Amsterdam, Posting 7 outlines that if a member persistently breaches the EU's founding rules (liberty, democracy, human legal rights and so on, outlined in https://elliottzrdox.thelateblog.com/30108682/detailed-notes-on-alternatif-member4d