Hillary can clearly be seen collapsing before being placed in the van at the 9/11 ceremony. Her head shaking and foot dragging point to a possible seizure. Could this be linked to her blood clot in 2012?

Trump has called Hillary many things in times past. He maintains she is ‘crooked’ and can never be straight with the American people, either in her business dealings or her period as Secretary of State. He believes, as we Brits like to say, that she is not a ‘fit and proper person’ to have charge of the destiny not just of her own nation, but that of the entire free world. He also holds that she represents the dark heart of the politico-economic system that he believes so oppresses the American nation. Now The Donald has found his ace in the hole: her very fitness to govern in the literal sense.

When called to the colours long ago as a humble National Serviceman, my countrymen proposed putting a gun in my hand with a license to use it against our country’s enemies – of which at that time there were many. But first they were going to ensure my competence, both mentally as well as physically. To that end I had to undergo a rigorous medical. They needed to know that I would be up to supporting my comrades, whose lives might depend on my actions. Any suspicion that I could fail at the crucial moment would have disqualified me.

The President of the United States operates on an altogether different plane. He or she, as Head of State as well as Commander-in-chief, has the lives and well-beings of countless millions as a responsibility. Physical as well as mental health is a crucial job requirement. The finger that hovers over the nuclear button must be up to it.

After this weekend, Hillary Clinton would be foolish to think that she can wave it all away with an unfunny joke, as she has done in the past over health issues. She is asking, on the strength of her say-so, that the American people trust her in the matter.

These are perilous times we are living through. The end of the imagined peace dividend that victory in the Cold War would bring us now seems a distant chimera.  An ever more assertive Putin in the Kremlin is joined by an almost deranged Kim Jong-un in North Korea, who in quick succession last week loosed off three ballistic missiles, while Syria burns. Hillary has been gung-ho for years to impose a no-fly zone over that country. While that might have made sense three years ago, with Russian jets now crisscrossing its skies daily such an imposition at this time could unleash a big power conflagration. The stresses of such a build -up of tensions would almost certainly bring on one of Hillary’s fits.

The truth is that it is just not good enough that the Americans and all the rest of us should have such worries concerning one individual’s health and fitness for purpose. Hillary must be prevailed on to submit herself to an independent panel of health experts or, at the very least, make her very latest, up-to-date medical records available for inspection.

In my view it is an open question whether she can survive the next two incredibly gruelling months of presidential campaigning. I said as much back in May when I wrote about Hillary and her questionable health on my blog. Now it is out in the open. If she steps down, or is forced to do so, who will take her place? Would good ol’ Joe Biden, Obama’s Vice President, step up to the plate to save the nation and possibly all the rest of us? Although there was talk of him throwing his hat into the ring during the primaries, I wouldn’t bet on that one. Bernie Sander’s devoted and almost messianic followers would be incandescent with rage were that to happen. Quite rightly, they would argue that, democratically, their man is the heir apparent. So Ultra-Left Bernie – the US’s own Jeremy Corbyn – would end in the ring against The Donald.

In that event would anyone care to place a bet against the world waking up one November morning, just a few weeks from now, to a President Donald Trump?