The top election official in the U.S. state of Georgia announced on Wednesday all the presidential ballots cast in the state will be recounted by hand.

"This will help build confidence. It will be an audit, a recount and a recanvas all at once," Georgia Secretary of State Brad Raffensperger said at a press conference. "It will be a heavy lift."

The recount will happen in all 159 counties in the state. The audit must be completed by November 20, the deadline for vote count certification.  

Read more: Counting and re-counting votes in the U.S. presidential election