US defence officials say 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. And it underscores fears that some of the very…

This post was originally published on South China Morning Post.