the chairman of a house committee investigating the 2012 terror attacks on americans in benghazi , libya , on thursday called former secretary of state hillary rodham clinton to testify at a public hearing next month .
the move will set up a high-profile showdown over clinton 's use of a private email account and server while she was secretary of state .
allow the gop to rehash questions about her performance before and after the deadly assault on a diplomatic compound and a cia annex nearby .