Transition briefings begin, as agencies prepare to welcome incoming officials
State governors issue certificates of ascertainment to officially appoint electors
Electors gather in each state to cast their official ballots
Christmas marks the deadline for the submission of Electoral College votes to reach Washington, DC
Congress convenes the members of the House electing the Speaker by a roll call
Congress certifies the Electoral College votes, formally affirming Trump's victory in the election
Trump takes the oath of office on inauguration day , marking the beginning of his second term