National Guard of the United States

Two members of the U.S. Army National Guard have been found to have ties to fringe right group militias. Consequently, they will be removed from the security mission to secure Joe Biden’s presidential inauguration.
No plot against Biden was found.

All 25,000 National Guard troops tasked with securing the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris on January 20 are being vetted by the Pentagon and the FBI amid fears of a coordinated insider attack.
"This type of vetting often takes place by law enforcement for significant security events. However, in this case the scope of military participation is unique. The DC National Guard is also providing additional training to service members as they arrive in DC that if they see or hear something that is not appropriate, they should report it to their chain of command," so Christopher Miller, the acting defence secretary.

After the FBI issued a warning of potential violence in all 50 state capitals ahead of President-elect Joe Biden's inauguration on January 29, state officials are preparing for potentialyl armed and violent protests. National Guard forces have been activated in California, Michigan, Pennsylvania, Kentucky and Florida. Washington, DC is bracing for further violent protests following the attack on the US Capitol earlier this month.
As of 10 am local time, Colorado has surpassed the voter turnout of the 2016 presidential election, so Colorado Secretary of State Jena Griswold on Tuesday, adding that the state was working with the National Guard to help monitor and protect the election support system. So far, at least 2,893,295 Coloradans have voted.

As the protests following the death of George Floyd at the hands of a police officer enter its seventh day, at least 40 US cities have imposed overnight curfews. Among those cities are Minneapolis, New York City, Los Angeles and a statewide curfew in Arizona. Washington, DC and at least 23 other cities have activated the National Guard.