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Personally, I find him the worst kind of MP, a grandstanding idiot, but opinion on the Marr interview seems to have genuinely split opinion.
No matter what you think of the erg they aren't comparable to nazi's. Rees Mogg retweeted a member of the AfD (a democratically-elected party) commenting on Brexit and the EU. I find it sinister that Lammy seems to believe that only parties he approves of should have airspace.
Of course parties should be called out on racism and anti-semitic but this to me is the typical Left Wing response that everybody who disagrees with me is a nazi