'Big voter fraud information coming out concerning Georgia. Stay tuned!' Trump tweeted.
Biden was declared the winner in Georgia after a hand recount this week and Trump's previous claims of fraud have been widely dismissed as his legal team has failed to supply any proof.
'I believe that the numbers that we have presented today are correct. The numbers reflect the will of the people,' Georgia Secretary of State Brad Raffensperger, a Republican, said of the result Friday.
The hand count showed Biden won by more than 12,000 votes out of about 5 million cast, according to data released by Raffensperger's office Thursday.
'Working as an engineer throughout my life, I live by the motto that numbers don't lie,' Raffensperger said during a news conference at the state Capitol.
Raffensperger, a self-described 'passionate conservative,' has endured criticism and insults from fellow Republicans - from the president to the chair of the state Republican Party - over his handling of the election. He acknowledged their feelings on Friday.