US National Security Adviser Jake Sullivan speaks during the daily press briefing in the Brady Press Briefing Room of the White House in Washington, DC, on November 13, 2024. US President-elect Donald Trump thanked President Joe Biden for pledging a smooth transfer of power as the victorious Republican made a historic return visit to the White House on Wednesday. (Photo by SAUL LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images)