Democrat Stacey Abrams says she can't win the Georgia governor's race, effectively ending her challenge to Republican Brian Kemp.

Her speech Friday effectively puts a stop to the contest. The final result had been in doubt for 10 days after the election.

Abrams made her announcement just after 5 p.m. That was the earliest state officials could certify the results after a court-ordered review of absentee, provisional and other uncounted ballots. Abrams' campaign had contended there were potentially enough uncounted votes to force a runoff.

Abrams had hoped to become the first black governor of the Deep South state and the first black female governor of any state.

Kemp is Georgia's former secretary of state. 

Abrams stressed as she spoke: "This is not a speech of concession."

A spokesman for the Kemp campaign didn't answer his phone and didn't immediately respond to a text message seeking comment after Abrams' speech.

Abrams did say she will file a federal lawsuit to challenge the "gross mismanagement" of Georgia elections.

She said: "In the coming days, we will be filing a major federal lawsuit against the state of Georgia for the gross mismanagement of this election and to protect future elections."

Abrams and voting rights activists have argued for months that Kemp mismanaged the elections system in his post as secretary of state.