Officials have said about 5,000 troops will remain in Washington for the next few weeks, when Trump will face his second impeachment trial in the Senate.
Tarrio, in an interview with Reuters Tuesday, denied working undercover or cooperating in cases against others.
Garret Miller, who is from the Dallas suburb of Richardson, was arrested Friday after being named in a five-count federal complaint.
Thousands of National Guard troops and security forces are out en masse for an Inauguration Day like no other in living memory amid violent threats from right-wing extremists.
The FBI is assisting the U.S. military in vetting more than 25,000 National Guard troops being deployed to help protect Joe Biden's inauguration for potential security concerns.
Dark smoke began to drift over the building shortly after 10 a.m. Monday as a rehearsal for President-Elect Joe Biden's inauguration was underway.
Army Secretary Ryan McCarthy said officials are conscious of the potential threat, and he warned commanders to be on the lookout for any problems within their ranks.
The heightened rhetoric mimics language far-right extremists and white supremacists have used for years, and it follows a year of civil unrest over the killing of George Floyd.
Trump is on the verge of being impeached for a second time, but the process to remove him from office could take place after he leaves the White House.
The FBI warned ominously Monday of potential armed protests by Trump supporters ahead of Biden's inauguration.