Since then, Ms Riley has continued to discuss Labour’s ongoing antisemitism crisis on her Twitter account.
Mr Hewer, formerly an aide to Lord Sugar on The Apprentice, renounced his support for the party via the social media site on Tuesday, saying he had voted for the party since 1964 but would not any longer.
He said he was "raised to abhor bigotry" and "astonished at the blunt assaults and trickster arguments fired at my friend and colleague for calling out antisemitism in that once great Labour party which I have voted for since 1964. Not any more.”