Yvette Cooper, the former shadow Foreign Secretary, later raised a point of order to call on Mr Cameron to withdraw his comment.
AUSTRIAN NATIONAL LIBRARY : a bunch of migrants
Ms Cooper requested that the House of Commons demand the comments be withdrawn but the Speaker, John Bercow, declined and said it was up to Mr Cameron to comment if he chose to.
On Twitter, shadow Home Secretary Andy Burnham said the moment showed the Conservative leader’s “mask slipping”.
“He just dismissed desperate people fleeing conflict as a “bunch of migrants” – on Holocaust Memorial Day,” he added.