The prominent Brexiteer and chair of ERG said he felt sorry for the Labour MP following his controversial comments which made him "look foolish". In a blistering attack, Mr Rees-Mogg said Mr Lammy's comments were "unbalanced" and would "damage his reputation".
He tweeted: "I feel sorry for Mr Lammy, comparing a Parliamentary ginger group with an organisation and creed that killed six million Jewish people makes him look foolish and his comments unbalanced.
"It damages his reputation."
Jacob Rees-Mogg's furious rant comes after Mr Lammy, who has campaigned for a second referendum, was confronted about his comparison on the BBC's Andrew Marr show.
The Labour MP was shown a clip of himself speaking at an anti-Brexit rally in which he implied the ERG should not be appeased, comparing it to the appeasement of the Nazis before World War 2.
Jacob Rees-Mogg has launched a
