Persona non grata I think.
This is from Dictionary.com
perˇsoˇna non graˇta
 [per-soh-nah nohn grah-tah; English per-soh-nuh non grah-tuh, grey-, grat-uh] plural perˇsoˇnae non graˇtae [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.