2weapon fighting, do you get at most 1 bonus hit a turn even if you have Extra Attacks from the fighter?

Regarding Potent Cantrip – we'll add cantrips that can benefit from it to Basic D&D

— Mike Mearls (@mikemearls) July 5, 2014

@SymphFanFor 2weapon fighting, do you get at most 1 bonus hit a turn even if you have Extra Attacks from the fighter? (Uses Bonus action) that's correct. Since it uses your onus action, you can only use it once

— Mike Mearls (@mikemearls) July 5, 2014