Whatever you think about Donald Trump, his main achievement has been to utterly discombobulate his enemies, especially the mainstream media in America.

If sometimes we think that the BBC dresses a little too far to the Left, try watching the Washington press pack in full flow. They believe it is their constitutional duty to destroy the democratically elected President by any means possible.

He's been accused of racism, sexism and colluding with the Russians to steal the presidential election, which bizarrely they also claim he never wanted to win in the first place. Go figure.

Like our own die-hard Remainers, any lie will do for the Never Trumpers. Their latest line of attack is to claim he is mentally ill, in the early stages of Alzheimer's, and therefore unfit for office.

If anyone is displaying signs of advanced mental illness, it's the mudslingers themselves, in their increasingly deranged desperation to find something, anything, which will bring down the President.

So it was with great relish that they turned up in force for the press conference given by Trump's personal physician, following his annual medical. Here, surely, would be the irrefutable evidence that Trump is clinically insane.

Donald Trump (left) has never touched alcohol or tobacco, whereas Winston Churchill (right) smoked and would drink regularly

They didn't get the answers they were looking for. Dr Ronny Jackson — who, incidentally, performed the same service for Barack Obama and George W. Bush — pronounced the President to be in 'excellent health' and said he had 'no concerns' whatsoever about Trump's cognitive abilities.

The Donald is slightly overweight, because of his fondness for fast food, and should exercise more. He takes a statin to fight cholesterol and a pill to tackle baldness. So no surprises there. He's never touched alcohol or tobacco and, overall, is in pretty good shape for a man of 71.

But instead of thanking Dr Jackson, folding their notebooks and resuming their search for KGB spies lurking in the White House basement, the press pack went completely bonkers.

What followed was an hilarious hour-long shouting match involving reporters furious that Dr Jackson wouldn't give any credence to their conspiracy theories.

They wanted to know everything from whether Trump is addicted to drugs, to how many scoops of ice cream he eats. They also claimed he is lying about his height, pretending to be taller than he is, to avoid being diagnosed as morbidly obese.

Madness? This really was One Step Beyond!

Meanwhile, back in the real world, cinema audiences all over the United States have been giving standing ovations at the end of Darkest Hour, Gary Oldman's acclaimed portrayal of Winston Churchill during World War II.

This got me wondering how the Great Man would have fared had he been subjected to the same kind of scrutiny and hostility that Trump is today.

Not that I am drawing any comparison between Churchill and Trump. Far from it. But in our wonderful world of social media and 24-hour rolling 'news', Winston wouldn't have lasted five minutes.

His disparaging remarks about Islam, early in his career, and his historical role in putting down the Suffragette protests would have been endlessly recycled by the Twitterati. He'd have been accused of being a warmonger, deliberately provoking Hitler.

If Churchill's personal physician had been forced to reveal the Prime Minister's medical results, food, drink and drugs consumption, Winston wouldn't only have been declared unfit for office, he'd probably have been sectioned. The press conference might have gone something like this . . .

President Donald Trump (pictured) takes a statin to fight cholesterol and a pill to tackle baldness

Good morning, gentlemen. I am Lord Moran, Mr Churchill's doctor, and after conducting a thorough examination at No 10 Downing Street this morning, I am delighted to report that the Prime Minister is in excellent health.

But, surely, Sir, Mr Churchill is clinically obese?

He may be somewhat short for his weight, but nothing a little light exercise can't cure. I am advised that the Prime Minister has taken up bricklaying.

What can you tell us about Mr Churchill's diet?

Mr Churchill eats no more than eight meals a day. He's partial to roast beef and Yorkshire pudding, lobster, dressed crab, jugged hare and has lately developed a liking for Indian curries. He also enjoys consommé, turtle soup and a cheese platter from Paxton & Whitfield of London.

All that food must put a strain on his heart.

Not at all. He's got the heart of a lion. As a matter of fact, Indian curries contain turmeric, an ingredient which has many beneficial anti-oxidant and anti-inflammatory properties.

Nevertheless, surely it would be better if he stuck to a vegetarian diet? It is Veganuary this month, you know.

Nonsense. May I remind you, sir, that Herr Hitler is a vegetarian. Look how that turned out.

Smoking all those cigars can't do him much good, though?

Quite the opposite, as it happens. We doctors recommend regular smoking, because it calms the nerves and soothes the throat, which is a great comfort to Mr Churchill, given all the speeches he has to make.

What about drink?

Winston Churchill (pictured in 1939) smoked cigars on a regular basis

That's very kind, I'll have a large gin and tonic.

Not you, doc. The PM. Everyone says he drinks like a fish.

It's true that Mr Churchill does like to start the day with a 'mouthwash' made from whisky and soda, which he considers the perfect accompaniment to his regular breakfast of kippers, bacon and eggs, perhaps a partridge or a brace of grouse.

We're told he guzzles champagne all day.

Not all day, by any means. But he does insist on a bottle of Pol Roger from a silver tankard each morning.

Sources tell us that he's permanently sozzled. You can hear him slurring his words on the wireless.

That's just the way he speaks. His dentures are loose.

So how much does he drink, then?

A modest amount, say, a few large brandies, a drop of Scotch, a glass or two of Amontillado, wine with dinner, obviously, and invariably a second bottle of Pol Roger as a nightcap.

Sounds as if he's a raging alcoholic.

Quite the opposite. As Mr Churchill always says: he has taken more out of alcohol than alcohol has taken out of him.

How much sleep does he get? I hear he's an insomniac.

He does like to work during the night, but he always takes a nap in the afternoon.

So he's asleep on the job?

A nap, I said. That's all. To reinforce himself for the dark days ahead.

Does a lot of reinforcing, doesn't he? How does he justify all that grub, all those cigars, all that brandy when the rest of the country is on meagre rations? Doesn't he know there's a war on?

Indeed he does, sir. It is his constant companion, along with his black dog.

What's his bulldog got to do with it?

Not his bulldog. Black dog is what Winston, Mr Churchill, that is, calls his bouts of depression and anxiety.

So you're telling us he's got some kind of mental illness?

He's not mentally ill, he's the sanest man I know. And his condition is eminently treatable.

You mean he's on drugs?

Nothing unusual. The occasional aspirin, barbiturates to help him sleep, amphetamines to keep him awake.

Amphetamines? What the Americans call Purple Hearts? He's a walking chemist's shop. A druggie, as well as an alky. At this rate, he'll never see the end of the war. He's clearly unfit for office. Isn't it time he surrendered to his addictions and resigned?

Gentlemen, I expect Mr Churchill to live to a ripe old age. He will never surrender. In fact, if Britain lasts for 1,000 years — and provided the Remoaners don't manage to overturn Brexit — people will say this was his Finest Hour.