A Nigerian-born Nobel-prize winning author who has taught at Cornell, Harvard and Yale Universities has thrown away his green card in protest of Donald J. Trump’s election win, The Independent reported. Wole Soyinka was the first African to win the Nobel Prize for Literature, in 1986.

Soyinka had previously pledged he would throw out his U.S. permanent residency permit and “start packing” if Trump were to win the presidency. “I have already done it, I have disengaged [from the United States]. I have done what I said I would do,” Soyinka reportedly said at a conference in Johannesburg.