“He won because the Election was Rigged,” Trump tweeted.
Trump had yet to concede the election to Biden who as called as the winner Nov. 7 after enough states results came in to hand the former Democratic vice president victory.
Instead, Trump has spent his days with few public events and pressed unsubstantiated allegations of fraud on social media.
The U.S. President has also stalled the government’s normal process of preparing for a new presidential administration, which both Democrats and some Republican have said has serious national security implications.
Trump’s campaign team and Republicans have also sought to press their case in court in key battleground states, but have been widely rejected.
Meanwhile, Biden and Vice President-elect Kamala Harris have moved forward with their transition efforts, including briefings on the COVID-19 outbreak.