Biden is now ahead by 1096 votes in Georgia,where counting continued early on Friday local time.
The shift in Georgia came hours after Trump appeared at the White House to falsely claim the election was being"stolen"from him.
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Trump had seen his lead steadily shrink in Georgia,a Southern state that has not voted for a Democratic presidential nominee since 1992,as officials worked through tens of thousands of uncounted votes,many from Democratic strongholds such as Atlanta.
The Georgia secretary of state reported late on Thursday local time there were about 14,000 ballots still to count in the state.
The state also will have to sift through votes from military personnel and overseas residents as well as provisional ballots cast on Election Day by voters who had problems with their registration or identification.