Nobel Prize-winning author Wole Soyinka said Thursday that he fulfilled his promise to throw away his United States green card and relocate if Donald Trump won the presidency.

“I’ve done it,” the Nigerian author told news channel eNCA on the sidelines of an education conference at the University of Johannesburg, Reuters reported.

“When I was ready, when I’d finished, I negotiated my departure,” he said.

Mr. Soyinka said Africans are worried that Mr. Trump could tarnish the legacy of President Obama, whose father was Kenyan.

“We on the African continent could boast that we had a contemporary descendent ruling the United States,” he said. “Suddenly, somebody is making speeches which are meant to reverse those gains.”

Mr. Soyinka won the Nobel Prize for Literature in 1986 and has been a regular teacher at American Ivy League universities, including Harvard, Cornell and Yale.

Despite his protest against President-elect Trump, Mr. Soyinka said he didn’t want to discourage others from applying for a green card.

“It’s useful in many ways. I wouldn’t for one single moment discourage any Nigerians or anybody from acquiring a green card… but I have had enough of it,” he said, Agence France-Presse reported.

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