What happened during the Trump call?
In excerpts of the 2 January phone call, Mr Trump can be heard alternately cajoling and pressurising Georgia's secretary of state.
He insisted that he had won the election in Georgia and told Mr Raffensperger that there was "nothing wrong with saying you have recalculated".
Mr Raffensperger responded by saying: "The challenge you have, Mr President, is that the data you have is wrong."
Later in the call, Mr Trump said the rumour was that ballots had been shredded and voting machinery had been removed from Fulton County in the state - claims denied by Mr Raffensperger's lawyer.
The president then threatened the official with possible legal consequences.
"You know what they did and you're not reporting it. That's a criminal offence. You can't let that happen. That's a big risk to you and to Ryan, your lawyer," Mr Trump said.
He then called for the extra 11,780 votes - which would have given him a total of 2,473,634 votes in the state, one more than Mr Biden, who received 2,473,633 votes.
The president told Mr Raffensperger he should re-examine the result in the state.