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WASHINGTON (AP) — President Joe Biden on Friday will nominate federal appeals court Judge Ketanji Brown Jackson to the Supreme Court, according to a person familiar with the matter.

In Jackson, Biden delivers on a campaign promise to make the historic appointment and to further diversify a court that was made up entirely of white men for almost two centuries. He has chosen an attorney who would be the high court’s first former public defender, though she also possesses the elite legal background of other justices.

Jackson would be the current court’s second Black justice — Justice Clarence Thomas, a conservative, is the other — and just the third in history.

The news was confirmed by a person familiar with the matter who spoke on the condition of anonymity to discuss it before the president’s official announcement later Friday.