They can't but they can and will lie to you and tell you they will deny entry. They also can and will threaten to revoke your passport despite no legal basis t

They can't but they can and will lie to you and tell you they will deny entry. They also can and will threaten to revoke your passport despite no legal basis to do so. They have made both statements to me. If you read above I said they would make "threats" to do so (of the sort a common citizen would probably believe), not that it would actually happen.