US law enforcement agencies have started to screen National Guard members to ensure they do not pose a security risk during President-elect Joe Biden’s inauguration.

General Daniel Hokanson, head of the National Guard Bureau, revealed the information on Sunday in Washington when asked by CBS News if troops were being checked as they arrived in Washington.

Hokanson said, “In coordination with the Secret Service and the FBI, they’re screening all the personnel that are coming in.”

The troops’ screening is to avoid the same January 6 riots at the Capitol building in support of outgoing President Donald Trump.

It was also revealed that some of those involved in the riot had current or former ties to the military.

General Hokanson said much of Washington resembles a fortified compound in a war zone, with most of the downtown area blocked off, security fences topped by razor wire and about 25,000 National Guard troops deployed to the capital.

In a recent letter to all US troops, the Joint Chiefs of Staff told service members the Jan 6 riots were "inconsistent with the rule of law" and said troops "must embody the values and ideals of the nation."