Troops vetted amid fears of insider attack at Joe Biden inauguration

The Capitol is seen as security preparations continue leading up to President-elect Joe Biden’s inauguration (J. Scott Applewhite/AP)

US defence officials said they are worried about an insider attack or other threat from service members involved in securing President-elect Joe Biden’s inauguration, prompting the FBI to vet all of the 25,000 National Guard troops coming into Washington for the event.

The massive undertaking reflects the extraordinary security concerns that have gripped Washington following the deadly January 6 insurrection at the US Capitol by pro-Trump rioters.