President-elect Donald Trump will nominate Gen. Keith Kellogg to serve as assistant to the president and special envoy for Ukraine and Russia.

Donald Trump picked retired General Keith Kellogg as his special envoy for Ukraine and Russia, choosing a longtime adviser who’s supported the president-elect’s aims to end the war swiftly, including by potentially cutting off military aid to Kyiv.

In June, Reuters reported that General Keith Kellogg proposed Donald Trump a plan that would cease military aid to Ukraine unless it agrees to hold peace negotiations with Russia.