The call he made after he lost the state
I just want to find 11,780 votes, which is one more than we have. Because we won the state.
To Georgia Secretary of State Brad Raffensperger, by phone · January 2021
Biden had won Georgia by 11,779 votes, a result the state had already confirmed with a full hand recount. On an hour-long recorded call, Trump pressed Raffensperger, a fellow Republican, to overturn it, and suggested he could face criminal liability if he refused. Raffensperger told him, "the data you have is wrong." The call became central evidence in the Fulton County racketeering case.
Sources: The call, in the January 6 committee report (govinfo.gov) · What he asked, line by line (PolitiFact)