(FILES) US President Barack Obama (L) walks out of the Oval Office with outgoing Federal Bureau of Investigations (FBI) director Robert Mueller (R) and Obama's nominee to replace Mueller James Comey at the White House in Washington, DC on June 21, 2013. Mueller, the former FBI director who led a politically explosive investigation into President Donald Trump, has died aged 81, US media reported on March 21, 2026. (Photo by Nicholas KAMM / AFP via Getty Images)