Some are now accusing Hur of having an agenda despite not having enough evidence to criminally indict Biden.
The speech comes the day after AG William Barr said the Justice Department has not uncovered evidence of voter fraud that would change the outcome of the election.
President Donald Trump is the apparent winner of the tightly contested race in North Carolina.
Georgia's latest vote totals, top races in the 2020 presidential election.
Klain served as chief of staff for Joe Biden during Barack Obama's first term and was chief of staff to Vice President Al Gore in the mid-1990s.