LITTLE ROCK, Ark. - Two white supremacists accused of plotting to assassinate Barack Obama are on lockdown in their Tennessee jail cell.

The Arkansas Democrat-Gazette reports that 20-year-old Daniel Cowart of Tennessee and 18-year-old Paul Schlesselman of Arkansas are under the lockdown for their own protection.

Obion County Sheriff Jerry Vastbinder says they were separated from other inmates at the request of federal authorities.

They can leave their cell for only an hour to watch television or use the phone. The sheriff says they have caused no problems since arriving about two weeks ago.

They have pleaded not guilty to weapons charges and threatening a presidential candidate.

They could face 50 years in prison and fines if convicted.