Does the Dueling fighting style work for versatile weapons like a longsword?

@JeremyECrawford planning on making a Samurai Fighter. Does the Dueling fighting style work for versatile weapons like a longsword?

— BeardedBear_ (@BeardedBear88) April 25, 2018

The Dueling fighting style works with a versatile weapon only when you attack with it using one hand. #DnD https://t.co/eobPEbRJ7G

— Jeremy Crawford (@JeremyECrawford) April 25, 2018