Nigel Farage has accused Brendan Cox, the husband of murdered Labour MP Jo Cox, of supporting extremism after he criticised Farage for attempting to link the Berlin attack to decisions made by Angela Merkel.
Brendan Cox, whose wife was murdered by far-right supporter Thomas Mair at the height of this summer's EU referendum campaign, criticised the former UKIP leader on Tuesday morning for blaming the German chancellor's migration policy for the Berlin terror attack.
Immediately afterwards Farage appeared on LBC radio and doubled down.
Farage said the million migrants accepted by Germany imperilled European "safety and civilisation", following reports that the driver of the lorry which was driven into a Berlin Christmas market was a 23-year-old refugee from Pakistan.
"I have to say, I'm not even sure why someone from Pakistan qualifies as a refugee," said Farage. "Let's be honest about this, Mrs Merkel made one of the worst policy decisions we've seen from a European leader in 70 years."
The former UKIP leader then attacked Brendan Cox for backing the anti-racism group Hope Not Hate.
"He'd know more about extremists than me, Mr Cox, he backs organisations like Hope Not Hate who masquerade as being lovely and peaceful but actually pursue violent and very undemocratic means," said Farage.
"I'm sorry Mr Cox but it is time people started to take responsibility for what's happened. Mrs Merkel has directly caused a number of social and terrorist problems in Germany."
In response, Nick Lowles, the founder of Hope Not Hate, said the comments were libellous and demanded that Farage apologise.
Farage's interview with LBC is available here.
Jim Waterson is a politics editor for BuzzFeed News and is based in London.
Contact Jim Waterson at firstname.lastname@example.org.
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