An explosion in downtown Nashville on Christmas morning set the city ablaze and crippled communication in Tennessee and Kentucky.
In contrast, right-wing extremists and white supremacists have killed at least 329 people in violent attacks since 1994.
If convicted of the felony charge, he faces up to 20 years in prison.
Law enforcement have expressed concerns that violent extremists in the U.S. and abroad will try to use the coronavirus pandemic to terrorize Americans.