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So, now we know what Donald Trump looks like wearing glasses.

The US President, 71, is rarely seen in spectacles but eagle-eyed photographers captured a few frames as he left his golf club this weekend.

Andrew Harnik, a photographer with the Associated Press, tweeted a picture saying it showed Trump "wearing reading glasses".

The tweet sparked a predictably sarcastic response and most were making the same joke.

"What for? He can barely read," wrote one.

"These are known as *tweeting* glasses," added another.

(Image: REX/Shutterstock)

(Image: REX/Shutterstock)

Another agreed: "Fake News. He doesn’t read."

Others were a little more imaginative.

"Those are his eclipse glasses. Finally found them under the car seat," another wrote.

While another added: "Those are "Watching Fox News" glasses, not reading glasses."

Trump has spent yet another weekend tweeting tirades and playing golf despite a number of ongoing crises affecting the White House.

The Pentagon has yet to explain how four US soldiers came to be killed in Niger by Islamic militants.

Trump did not attend the funeral of one of the victims, Sgt La David Johnson, in Florida on Saturday.

He was also conspicuously absent from the One America Appeal concert for victims of recent hurricanes in Texas on Saturday night.

The five living former presidents - Barack Obama, Bill Clinton and Jimmy Carter and George H W Bush and George W Bush - stood united in support of their fellow countrymen.

Donald Trump did not appear but recorded a video message in which he thanked "some of America's finest public servants" for spearheading the appeal.

The White House did not respond to questions over whether the President had been invited.

And it emerged the US Air Force is preparing to put nuclear bombers back on 24-hour ready alert for the first time since the Cold War.

B-52 planes loaded with nuclear weapons would be positioned to take off at any moment, with crews on standby at a base in Louisiana.