Persona non grata I think.
This is from Dictionary.com
per·so·na non gra·ta
[per-soh-nah nohn grah-tah; English per-soh-nuh non grah-tuh, grey-, grat-uh] plural per·so·nae non gra·tae [per-soh-nahy nohn grah-tahy; English per-soh-nee non grah-tee, grey-, grat-ee] Latin.
1. a person who is not welcome: He has become persona non grata in our club since his angry outburst.
2. a diplomatic representative unacceptable to an accrediting government.