As US presidential campaign messages go, it at least had the benefit of being uniquely depressing.

O’Rourke didn’t quite scream ‘WE’RE ALL GONNA DIE!’ but he might as well have done.

In direct contrast to Donald Trump’s upbeat winning 2016 slogan of ‘Make America Great Again’, O’Rourke thinks he can win in 2020 by telling 320 million Americans they’re all doomed.

‘We face catastrophe and crisis on this planet,’ he declared, asserting that climate change will unleash ‘massive migration of tens or hundreds of millions of people from countries that are literally uninhabitable or under water.’

He’s not even promising to stop it.