Kurt Volker, executive director of the Arizona-based McCain Institute, resigned Friday as the Trump administration's special envoy to Ukraine amid questions over his dealings with the president's attorney and ahead of a congressional interview stemming from the impeachment inquiry.
Volker quit the unpaid position with the State Department, according to Arizona State University President Michael Crow, who told The Arizona Republic his staff discussed the matter with Volker.
Volker will remain with ASU's McCain Institute for International Leadership, said Luke Knittig, an institute spokesman.
Volker has headed the McCain Institute since its founding in 2012. He has been a Senior Fellow at the Center for Transatlantic Relations at Johns Hopkins University and a Senior Advisor at the think tank Atlantic Council since 2009.
Here is his biography from the McCain Institute.