ITV News Correspondent Dan Rivers has more on the incident involving French President Emmanuel Macron
In a video widely-shared on social media, Mr Macron is seen walking up to a barrier on a trip to Tain-l'Hermitage outside the city of Valence to meet the crowds waiting to see him.
A man slaps Mr Macron in the face before officers quickly move in. The president, meanwhile, is rushed away.
As the president is slapped, the words "Down with Macron-ism" are shouted.