Ukip leader Nigel Farage dismissed Tony Blair as an "embarrassment" who should hold his tongue - and added he is opposed to Western military intervention in Iraq or Syria.
Mr Farage was commenting on the former PM's claims that lack of intervention in Syria is to blame for rise of Islamist insurgents in Iraq.
The Ukip leader said Mr Blair's "state of outright denial of the obvious consequences of his disastrous decision-making on Iraq is making increasingly uncomfortable viewing."
"In almost every country in which the West has intervened or even implied support for regime change, the situation has been made worse and not better," he said.
More top news
A man who found a fake moustache hidden in a water vale has discovered his ex-housemate had been planning an long-term dad-joke.
Islamic State militants have released a video which shows British hostage John Cantlie talking to camera, appearing to read from a script.
Scientists at Nasa say that a ship they blasted into space 10 months ago is expected to reach the red planet on Sunday.