The FBI, which is part of the Department of Justice, seized ballots and other records tied to the 2020 election from a Fulton County election center near Atlanta on Jan. 28.

A newly unsealed affidavit showed that a criminal investigation into the 2020 election in Fulton County, Ga., relied heavily on claims about ballots that have been widely debunked.

In a phone call months later, Trump pressured Georgia Secretary of State Brad Raffensperger (R) to “find 11,780 votes,” roughly the number of ballots needed to flip the state in the incumbent presiden...