Presently observed scaling laws in tokamak experiments allow ignition of tokamak reactors with nre possibly as low as 4.5 × 1013 cm−3·s. These reactors operate in the hot-ion ignition mode with Ti>Te and are a direct extension of the hot-ion-mode operation observed in present tokamaks and expected in TFTR. They require MHD stability similar to conventional tokamak reactors and microstability at collision-ality ten times lower than that observed on PLT. All physics issues associated with hot-ion ignited reactors, short of complete ignition, can be addressed in existing facilities and TFTR.