When the ZANU-PF–MDC national unity government was sworn in on 13 February 2009, Mumbengegwi was retained as Minister of Foreign Affairs.
A short list of his students include his cabinet colleagues Charles Utete, Patrick Chinamasa, Simbarashe Mumbengegwi, Witness Mangwende, July Moyo, Simon Khaya Moyo, and other notables such as author Thompson Tsodzo, clerk of parliament Austin Zvoma, opposition leader Tendai Biti, cardiologist Jonathan Matenga, journalist Geoffrey Nyarota, and pioneer lawyers Chirunda and Chihambakwe.